The acceleration of a car is zero when it is driving up a long straight incline at constant speed.
In physics, acceleration is defined as the rate of change of velocity per unit time. When an object is moving in a straight line with constant speed, the acceleration is zero. This means that there is no change in the object's velocity or direction. However, acceleration is not only about the change in speed but also about the change in direction. When an object is changing direction, even if its speed is constant, its acceleration is non-zero.
Now let's look at the given options:
Traveling over the crest of a hill at a constant speed - acceleration is non-zero because crests are usually curved which means there is some centripetal acceleration associated with the car.
Speeding up as it descends a long straight decline - acceleration is non-zero.
Driving up a long straight incline at a constant speed - acceleration is zero
Bottoming out at the lowest point of a valley at a constant speed - acceleration is non-zero because valleys are usually curved so there is some centripetal acceleration associated with the car.
Turning right at a constant speed - acceleration is non-zero (because of the change in direction).
Therefore, the acceleration of a car is zero when it is driving up a long straight incline at a constant speed.
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a plane is moving due north, directly towards its destination. its airspeed is 210 mph. a constant breeze is blowing from west to east at 20.0 mph. at what rate is the plane moving north?
The rate at which the plane is moving north is 210 mph.
We can use vector addition to solve this problem. Let's denote the speed of the plane with respect to the ground as V, and the speed of the wind as W. We can break down the speed of the plane into two components: one component due north, denoted as Vn, and one component due east, denoted as Ve. Similarly, we can break down the speed of the wind into two components: one component due north, denoted as Wn, and one component due east, denoted as We.
Since the plane is moving directly towards its destination, we know that the component of its velocity due east, Ve, is zero. Therefore:
V = [tex]\sqrt{(Vn^2 + Ve^2) }[/tex]= Vn
We also know that the speed of the wind due north, Wn, is zero (since the wind is blowing from west to east). Therefore:
W = [tex]\sqrt{(Wn^2 + We^2)}[/tex] = We
Now, we can use vector addition to find the speed of the plane due north. The northward component of the plane's velocity is given by:
Vn = V * cos(theta)
where theta is the angle between the velocity vector and the northward direction. Since the plane is moving due north, theta is 0 degrees. Therefore:
Vn = V * cos(0) = V
The northward component of the wind's velocity is given by:
Wn = W * sin(theta)
where theta is the angle between the velocity vector and the northward direction. Since the wind is blowing from west to east, theta is 90 degrees. Therefore:
Wn = W * sin(90) = W
Now, we can add the northward components of the plane's and the wind's velocities to find the northward component of the resultant velocity:
Vn + Wn = V + W * sin(90)
Simplifying this equation, we get:
Vn = V + Wn = V + W * sin(90) = 210 + 0 * sin(90) = 210 mph
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a light has the frequency of 4.74 x 1014 sec-1 (hz). what is the wavelength? please show all the steps and all of your work when you upload your final answer.
The wavelength of a light wave can be calculated by the equation λ = c/f, where λ is the wavelength, c is the speed of light (3x[tex]10^{8}[/tex] m/s) and f is the frequency (4.74 x [tex]10^{14}[/tex] [tex]sec^{-1}[/tex]). Therefore, the wavelength of the light wave is 6.32 x [tex]10^{-7}[/tex] m.
The given frequency is 4.74 x 1014 sec-1. The formula to calculate the wavelength of a light wave is λ= c/f where c is the speed of light and f is the frequency of the light wave.
Therefore, λ= c/f= (3.00 x [tex]10^{8}[/tex] m/s)/(4.74 x [tex]10^{14}[/tex] [tex]sec^{-1}[/tex])= 6.32 x [tex]10^{-7}[/tex] m or 632 nm (rounding to three significant figures).
The wavelength of light is 6.32 x [tex]10^{-7}[/tex] m or 632 nm (rounding to three significant figures).
Formula to calculate the wavelength of a light wave: λ= c/f where c is the speed of light and f is the frequency of the light wave.
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What happens as a result of the photoelectric effect?
OA. Light acts as a wave of decreasing wavelength.
B. An object emits radiation according to its temperature.
C. An electric current is produced.
OD. Light is produced.
The photoelectric effect refers to the phenomenon of electrons being emitted from a metal surface when light shines on it.
What is Photoelectric Current?
The photoelectric effect is the phenomenon where electrons are emitted from a metal surface when light shines on it. The photoelectric current is the flow of these electrons that are emitted from the metal surface. The amount of photoelectric current depends on the intensity of the light, the frequency of the light, and the properties of the metal surface. When a photon of light with sufficient energy is absorbed by an atom in the metal, an electron is ejected from the metal surface, which then contributes to the photoelectric current.
When a photon of light with sufficient energy strikes the surface of a metal, it can transfer its energy to an electron in the metal, causing the electron to be ejected from the metal surface. This effect demonstrates that light behaves as both a wave and a particle, as it is the particle-like behavior of the photons that causes the ejection of electrons from the metal.
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a small truck has a mass of 2135 kg. how much work is required to decrease the speed of the vehicle from 21.0 m/s to 15.0 m/s on a level road?
The work required to reduce the velocity of the truck from 21.0 m/s to 15.0 m/s on a level road is [tex]3.10 * 10^5 J.[/tex]
What is work?
Work is defined as the measure of energy that is transferred to or from an object through an external force. Work is a scalar quantity that has only magnitude and no direction. The symbol for work is W, and its unit of measurement is Joule (J).
Formula to calculate work:
W = Fdcosθ
where W is work done, F is the force applied is the displacement, cosθ is the angle between the force and the displacement.
The work done in slowing down the truck is given by the difference between the kinetic energy before and after the truck is slowed down.
W = KEi - KEf = 0.5 * [tex]mvf^2 - 0.5 * mvi^2[/tex]
where KEi is the initial kinetic energy KE, f is the final kinetic energy, m is the mass of the truck, v is the final velocity of the truck, vi is the initial velocity of the truck.
Calculation of work done
Initial Kinetic Energy (KEi)
[tex]= 0.5 * mvi^2= 0.5 * 2135 * 21^2= 2.16 * 10^6 J[/tex]
Final Kinetic Energy (KEf)
[tex]= 0.5 * mvf^2\\= 0.5 * 2135 * 15^2\\= 1.18 * 10^6 J[/tex]
Work Done = KEi - KEf
[tex]= 2.16 * 10^6 - 1.18 * 10^6\\= 0.98 * 10^6 \\ =9.8 * 10^5 J\\= 3.10 * 10^5 J (approximate)[/tex]
Hence, the work required to decrease the speed of the vehicle from 21.0 m/s to 15.0 m/s on a level road is [tex]3.10 * 10^5 J[/tex].
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your instructor challenges you and your friend to pull on the ends of a horizontal rope attached to a pair of scales in a tug-of-war, but in such a way that the scale readings on the scales are different. can this be done? explain.
Answer:
If the scale readings are different then there will be a net force on the person attached to the scales:
Consider any point on the rope - if the forces in each direction are the same there is no acceleration of the rope
F = Δm * a for any portion of the rope with mass Δm
If any portion of the rope is accelerated, the person attached to the rope must be accelerated
a stone is dropped into a well. the sound of the splash is heard 3.00 s later. what is the depth of the well?
A stone is dropped into a well. the sound of the splash is heard 3.00 s later. The depth of the well is: 510 m
A stone is dropped into a well and the sound of the splash is heard 3.00 s later. To calculate the depth of the well, we can use the equation :
Depth = (Speed of sound x Time taken)/2
where the Speed of sound is 340 m/s. Therefore, the depth of the well is calculated to be 510 m.
To explain this in more detail, the equation states that the depth of the well is calculated by multiplying the speed of sound by the time taken for the sound to reach the surface of the well. This is then divided by two as the sound wave needs to travel to the bottom of the well and then back up to the surface.
In this case, the speed of sound is 340 m/s and the time taken for the sound to reach the surface is 3.00 s, so the depth of the well is 510 m.
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what is the wavelength of the peak of the blackbody radiation curve for the human body (t5 310 k)? what type of em wave is this?
The peak wavelength of the blackbody radiation curve for the human body (t5 310 K) is approximately 9.7 micrometers and the type of electromagnetic wave is infrared radiation. Infrared radiation is part of the electromagnetic spectrum and is often referred to as the "heat" radiation because it is emitted by objects that are slightly warmer than room temperature.
The wavelength of infrared radiation is typically in the range of 0.75 micrometers to 1000 micrometers. The peak wavelength of the blackbody radiation curve for the human body (t5 310 K) is the longest wavelength of radiation emitted by the body.
In order to determine the peak wavelength, the Stefan-Boltzmann Law must be applied. This law states that the total amount of energy emitted by a blackbody per unit area is proportional to the fourth power of its absolute temperature. By rearranging the equation, we can calculate the peak wavelength, which is then equal to 2.89 * 10^-3 m * (T^-1/4). Since the temperature is 310 K, the peak wavelength of the blackbody radiation curve for the human body (t5 310 K) is approximately 9.7 micrometers.
The type of electromagnetic wave emitted by the human body at a temperature of 310 K is infrared radiation. Infrared radiation is part of the electromagnetic spectrum and has a wavelength in the range of 0.75 micrometers to 1000 micrometers. Infrared radiation is often referred to as the "heat" radiation because it is emitted by objects that are slightly warmer than room temperature.
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two charges that are 1 meter apart repel each other with a force of 2 n. if the distance between the charges is increased to 2 meters, the force of repulsion will be
Answer: Two charges that are 1 meter apart repel each other with a force of 2 N. If the distance between the charges is increased to 2 meters, the force of repulsion will be 0.5 N.
What is Coulomb's law?
Coulomb's law is a scientific law that relates to the interaction between two electrically charged objects. The power of the force acting between two point charges is proportional to the product of the magnitude of the charges and inversely proportional to the square of the distance between them.
Coulomb's law equation can be written as: F = k(q₁q₂)/r²
Where, F is the electric force, q₁ and q₂ are charges, r is the distance between charges, and k is a constant with a value of 8.99 x 10⁹ Nm²/C².
So, when the distance between two charges is doubled, the force of repulsion decreases by a factor of four (2²).
Therefore, if the distance between the two charges is increased to 2 meters, the force of repulsion will be 2/4 = 0.5 N.
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two blocks are connected by a massless string that passes over a massless pulley. in the absence of friction, how does the tension force exerted by the string on the 250 n block compare with the tension force exerted by the string on the 350 block
Since the string is massless and the pulley is massless and frictionless, the tension force in the string is the same on both sides of the pulley. This means that the tension force exerted by the string on the 250 N block is the same as the tension force exerted by the string on the 350 N block.
This can be explained by considering Newton's second law, which states that the net force acting on an object is equal to the product of its mass and acceleration. In this case, the net force on each block is equal to the tension force in the string, since there is no friction. Since the blocks are connected by the string and the pulley, they both have the same acceleration. Therefore, the net force on each block must be the same.
Thus, the tension force exerted by the string on the 250 N block is equal to the tension force exerted by the string on the 350 N block.
The tension force exerted by the string on the 250 N block is equal to the tension force exerted by the string on the 350 N block. This is because, in the absence of friction, the forces acting on the blocks are balanced and in equilibrium.
When the 250 N block is pulled down, the 350 N block is pulled up with the same magnitude of force. This is due to the Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.
Thus, the tension force exerted by the string on the 250 N block is the same as the tension force exerted by the string on the 350 N block. This is the case regardless of the masses of the blocks, since the string and pulley are massless. Therefore, tension forces on both the blocks are equal.
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a 10 gauge copper wire carries a current of 21 a. assuming one free electron per copper atom, calculate the magnitude of the drift velocity of the electrons.
To calculate the magnitude of the drift velocity of the electrons ,
The drift velocity of electrons in a conductor is given by the formula:
v = I / (neA)
where 'v' is the drift velocity of electrons,
'I' is the current flowing through the wire,
'n' is the number of free electrons per unit volume,
'e' is the charge on each electron, and
'A' is the cross-sectional area of the wire.
Therefore, The current-carrying capacity of the 10 gauge copper wire is
I = 21 A which is a given statement.
For copper, the number of free electrons per unit volume is approximately [tex]8.5*10[/tex]²⁸ electrons/m³, and the charge on each electron is 1.6 x 10⁻¹⁹ C.
The cross-sectional area of a 10 gauge copper wire is approximately 5.26 mm²= 5.26 x 10⁻⁷ m².
Substituting these values into the formula of drift velocity we get:
v = (21 A) / ((8.5 x 10²⁸ electrons/m³) x (1.6 x 10⁻¹⁹ C/electron) x (5.26 x 10⁻⁷ m²))
= 0.015 m/s
Therefore, the magnitude of the drift velocity of the electrons in the wire is approximately 0.015 m/s.
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this hubble space telescope photo shows the bright active galactic nucleus in the center of galaxy m87. what is the long bluish streak coming out of it?
The bright active galactic nucleus in the center of the galaxy M87 was captured by the Hubble Space Telescope, and there is a long bluish streak coming out of it.The long bluish streak seen coming out of the bright active galactic nucleus in the center of the galaxy M87 is known as a jet.
The jet is a column of matter (plasma, in this case) that is ejected from the core of the galaxy at high speeds, typically close to the speed of light. The jet from the core of M87 is one of the most prominent in the universe, extending several thousand light-years into space.
The bluish color of the jet is due to synchrotron radiation, which is produced when electrons move at relativistic speeds in a magnetic field. The magnetic field and the relativistic motion of the electrons cause them to emit radiation in the form of radio waves, which are then stretched into the visible range by the Doppler effect.The jet from the core of M87 is a sign of the galaxy's activity, which is fueled by the supermassive black hole at the center of the galaxy.
The black hole, which has a mass of billions of times that of the Sun, is surrounded by an accretion disk of hot gas and dust. As matter falls into the black hole, it heats up and emits radiation, which powers the jet.The study of active galactic nuclei and their jets is a fascinating area of astrophysics, as it offers insights into the nature of black holes, the behavior of matter in extreme conditions, and the evolution of galaxies over cosmic time.
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for external force convection calculation, the characteristic length for a circular cylinder or a sphere in a flow process over the surface is taken to be (where represents internal diameter and represents external diameter.) hint: pay attention to slide 6 and example 7.1 in the lecture notes. which characteristic length is used to characterize nu for a cylinder or a sphere?
The correct option is C, For external force convection calculation, the characteristic length for a circular cylinder or a sphere in a flow process over the surface is taken to be external diameter.
Diameter is a fundamental concept in geometry and mathematics that refers to the length of a straight line segment that passes through the center of a circle or sphere, and whose endpoints lie on the circle or sphere's circumference. In other words, it is the distance between any two points on the circle or sphere that pass through the center.
The diameter is an important property of a circle or sphere because it determines many other properties, such as the circumference, area, and volume. The diameter is also used in various engineering and scientific applications, such as determining the size of pipes, measuring the distance between two opposite points on a sphere or circle, and calculating the volume of spheres or cylinders.
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Complete Question: -
For external force convection calculation, the characteristic length for a circular cylinder or a sphere in a flow process over the surface is taken to be (Hint: pay attention to slide 6 and example 7.1 in the lecture notes. which characteristic length is used to characterize nu for a cylinder or a sphere)
a. internal diameter
b. internal diameter/2
c. external diameter
d. external diameter/2
e. external diameter/6
According to the formula E=mc2:a. mass has to travel at the speed of light before it can produce any energyb. energy can travel much faster than light (in fact its speed can be the speed of light squared)c. a little bit of mass can be converted into a substantial amount of energyd. when two masses collide, we always get a lot of lighte. Einstein was a male chauvinist twice over
Answer:conversion factor between time and distance. If you have a certain amount of time tt, you can calculate the corresponding amount of distance by multiplying it by cc.Note: I'm not talking about the distance any particular object travels in the time tt. If you have a car traveling at speed vv, you can find out how far the car moves in time tt by multiplying by vv, but that's not converting time into distance. The conversion is something more fundamental.The fact that time and distance can be converted into each other like this is one of the ways relativity changed our view of the world. One of its consequences is that speeds can now be measured as pure, unitless numbers. How so? Well, normally, we might measure distance in meters and time in seconds. So when you calculate a velocity as distance divided by time, you get an answer in meters per second. But because time can be converted into distance, now you can measure time in meters as well. So if you divide distance (in meters) by time (in meters), the meters cancel out and you get a pure number.As a pure number, c=1c=1. There are a few things that travel at speed 1, including light and gravity. Light was simply the first one that we discovered, which is the only reason cc is called the "speed of light."Once you see that cc is important for reasons having nothing to do with the fact that light travels at that speed, hopefully it seems less strange that it enters into the formula E=mc2E=mc2. Just as you can convert time into distance, you can also convert mass into energy. You just have to multiply by cc twice, not just once, to make the units work out.
Explanation:conversion factor between time and distance. If you have a certain amount of time tt, you can calculate the corresponding amount of distance by multiplying it by cc.Note: I'm not talking about the distance any particular object travels in the time tt. If you have a car traveling at speed vv, you can find out how far the car moves in time tt by multiplying by vv, but that's not converting time into distance. The conversion is something more fundamental.The fact that time and distance can be converted into each other like this is one of the ways relativity changed our view of the world. One of its consequences is that speeds can now be measured as pure, unitless numbers. How so? Well, normally, we might measure distance in meters and time in seconds. So when you calculate a velocity as distance divided by time, you get an answer in meters per second. But because time can be converted into distance, now you can measure time in meters as well. So if you divide distance (in meters) by time (in meters), the meters cancel out and you get a pure number.As a pure number, c=1c=1. There are a few things that travel at speed 1, including light and gravity. Light was simply the first one that we discovered, which is the only reason cc is called the "speed of light."Once you see that cc is important for reasons having nothing to do with the fact that light travels at that speed, hopefully it seems less strange that it enters into the formula E=mc2E=mc2. Just as you can convert time into distance, you can also convert mass into energy. You just have to multiply by cc twice, not just once, to make the units work out.
a 0.60 kg block on a surface of negligible friction is pulled by a string which is passed over a pulley of negligible mass and friction, and is connected to a hanging 0.20 kg block. in terms of acceleration due to gravity g
g/2 is the acceleration
Let the tension in the string pulling 0.60 kg block is T
In a pulley system tension will be the same throughout the string
for 0.60kg block:
mg-T = ma
0.60g-T = 0.60a ..............(1)
for 0.20kg block:
T-mg = ma
T - 0.20g = 0.20a .............(2)
Solving equation 1 and 2:
(1)+(2)
0.60g-0.20g = 0.60a+0.20a
a = (0.60-0.20)g/(0.60+0.20)
a = 0.40g/0.80
a = g/2
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Part 1: An open vertical tube has water in it. A tuning fork vibrates over its mouth. As the water level is lowered in the tube, the seventh resonance is heard when the water level is 198.25 cm below the top of the tube. 198.25 cm What is the wavelength of the sound wave? The speed of sound in air is 343 m/s. Answer in units of cm.
Part 2: What is the frequency of the sound wave; i.e., the tuning fork? Answer in units of s^−1 .
Part 3: The water continues to leak out the bottom of the tube. When the tube next resonates with the tuning fork, what is the length of the air column? Answer in units of cm.
Part 1: The wavelength of the sound wave is 47.26 cm
Part 2: Frequency is 725.49 s^-1
Part 3: The length of the air column when the tube resonates again is 70.695 cm.
How did we get these values?Part 1:
The wavelength of the sound wave can be calculated using the formula:
wavelength = 4L/n
where L is the length of the air column in the tube and n is the harmonic number (in this case, n = 7).
Given that the water level is 198.25 cm below the top of the tube, the length of the air column is:
L = total length of tube - water level = 4L - 198.25
Solving for L, we get:
L = 198.25/3 = 66.083 cm
Therefore, the wavelength of the sound wave is:
wavelength = 4L/n = 4(66.083)/7 = 47.26 cm
Part 2:
The speed of sound in air is 343 m/s. The frequency of the sound wave can be calculated using the formula:
frequency = speed of sound / wavelength
Substituting the values we have:
frequency = 343 / (47.26/100) = 725.49 s^-1
Part 3:
When the tube resonates again, the air column length will be equal to a multiple of half-wavelengths. Since the tube was already in its 7th harmonic, the next resonance will occur in the 8th harmonic, which means the air column will be equal to 8 times half-wavelengths.
So, the length of the air column can be calculated using the formula:
L = (2n-1)wavelength/4
where n is the harmonic number (in this case, n = 8).
Substituting the values we have:
L = (2(8)-1)(47.26/2)/4 = 282.78/4 = 70.695 cm
Therefore, the length of the air column when the tube resonates again is 70.695 cm.
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: assuming equal mass, which will have the higher escape velocity from its surface, a large diameter planet or a small diameter planet?
Assuming equal mass, a small-diameter planet will have a higher escape velocity from its surface compared to a large-diameter planet.
This is due to the gravitational force being concentrated in a smaller area. The higher gravitational force from a smaller planet means that the escape velocity is greater, as the gravity is greater.
To calculate the escape velocity, we use the formula:
v = √(2GM/R), where G is the gravitational constant, M is the mass of the planet, and R is the radius.
We can see that the escape velocity is inversely proportional to the radius, so as the radius decreases, the escape velocity increases. This is why a small-diameter planet will have a higher escape velocity than a large-diameter planet with the same mass.
In conclusion, the escape velocity from the surface of a small-diameter planet will be higher than the escape velocity from the surface of a large-diameter planet, assuming they have the same mass.
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g a research rocket is launched from boulder straight towards the south. how would the coriolis effect change the path of the rocket?
For a rocket launched southward from Boulder, the Coriolis effect would cause it to drift to the east, leading to a curved flight path rather than a straight one.
The Coriolis effect is an important force to consider when launching a research rocket from Boulder. The Coriolis effect is the result of Earth's rotation and will cause any object moving along the surface of the Earth to veer to the right in the Northern hemisphere and to the left in the Southern hemisphere.
This effect is most noticeable for objects traveling long distances, such as a rocket. As it continues to fly south, the Coriolis force will continue to act upon it, increasing the curvature of its path. The magnitude of the Coriolis force depends on the speed of the object and its distance from the poles. Therefore, the more time the rocket has to travel, the more it will be deflected from its intended path.
The Coriolis effect is an important factor to consider for any research rocket launch. It has the potential to affect the accuracy and success of the mission and must be taken into account when planning a launch trajectory.
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A research rocket is launched from Boulder straight towards the south. How would the Coriolis effect change the path of the rocket?
when you walk at an average speed of 4 m/s, in 4 s you'll cover a distance of group of answer choices 25 m 2 m 15 m 16 m 4 m
If you walk at an average speed of 4 m/s for 4 seconds, you will cover a distance of 16 m. To calculate this, use the formula distance = speed x time.
When you walk at an average speed of 4 m/s, in 4 s you'll cover a distance of 16 m.
Walking refers to a mode of human transportation that is distinguished by a person's feet contacting the ground. It is one of the most basic human forms of transportation. Distance is a numerical measurement of how far apart objects or points are.
Average speed refers to the average speed at which an object or particle moves, whether it is going in a straight or curved path. The average speed is computed by dividing the total distance traveled by the total time taken for a journey or displacement.
Distance = Average speed × Time
For instance, if you walk at an average speed of 4 m/s, in 4 s you'll cover a distance of:
Distance = Average speed × Time
Distance = 4 m/s × 4 s
Distance = 16 m
Therefore, the answer is 16 m.
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al is floating freely in his spacecraft, and you are accelerating away from him with an acceleration of 9.8 m/s2. how will you feel in your spacecraft? group of answer choices you will feel weight, but less than on earth. you will feel yourself pressed against the back of your spaceship with great force, making it difficult to move. you will feel the same weight as you do on earth. you will be floating weightlessly. you will feel weight, but more than on earth.
You will feel yourself pressed against the back of your spacecraft with great force, making it difficult to move. This is because when you accelerate, the force of gravity is increased, causing you to feel an increased weight.
This option is the correct one. As per Newton's second law, the force of the body is directly proportional to the mass and acceleration. Here, the acceleration is 9.8 m/s2, which means you will feel yourself pressed against the back of your spaceship with great force, making it difficult to move, you will feel the same weight as you do on earth.
This is an incorrect option because the acceleration is greater than 1g, which means the weight will be greater than the actual weight.you will be floating weightlessly. This is an incorrect option because there is an acceleration, which means you will not be floating weightlessly.you will feel weight, but more than on earth. This is an incorrect option because the acceleration is greater than 1g, which means the weight will be greater than the actual weight.
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The human ear canal is about 2.6 cm long and can be regarded as a tube open at one end and closed at the eardrum. What is the fundamental frequency around which we would expect hearing to be most sensitive? Assume the speed of sound in air to be 338 m/s. Answer in units of kHz
6.85 kHz is the basic frequency that we would anticipate having the greatest sensitivity in hearing.
A periodic waveform's lowest frequency is referred to as the fundamental frequency, or just the fundamental. The fundamental frequency is determined by the length of the tube, which in this case is 2.6 cm. The equation for the fundamental frequency of a tube open at one end and closed at the other is [tex]f=\frac{v}{2L}[/tex],
where L is the tube's length and v is the sound-traveling speed in air. In this situation
we have
[tex]f=\frac{338 m/s}{2(0.026 m)}\\\\f = 6.85 kHz.[/tex]
Consequently, we would anticipate that hearing would be most sensitive around the fundamental frequency of 6.85 kHz.
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calculate the kinetic energy of a ball of mass 50g travelling at 30m/s. how much work will need to bee done to stop the ball?
Taking into account the definition of kinetic energy and work, the kinetic energy of a ball of mass 50 g travelling at 30 m/s is 22.5 J and a work of 22.5 J must be done in an opposite direction to stop the ball.
Definition of kinetic energyKinetic energy is defined as the energy associated with bodies that are in motion.
Kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed. This will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.
Kinetic energy is represented by the following expression:
Ec = 1/2×m×v²
Where:
Ec is kinetic energy, which is measured in Joules (J).m is mass measured in kilograms (kg).v is velocity measured in meters over seconds (m/s).Definition of workThe kinetic energy theorem states that the work done by the applied net force (sum of all forces) is equal to the change in kinetic energy:
Work= Ec final - Ec original
Kinetic energy of the ballIn this case, you know:
m= 50 g= 0.05 kg (being 1000 g= 1 kg)v= 30 m/sReplacing in the definition of kinetic energy:
Ec = 1/2× 0.05 g× (30 m/s)²
Solving:
Ec= 22.5 J
The kinetic energy is 22.5 J.
Work to stop the ballStoping the ball means bringing the velocity to zero. This is:
Ec final= 1/2× 0.05 g× (0 m/s)²
Ec final= 0
Then, work can be calculated as:
Work= Ec final - Ec initial
Work= 0 - 22.5 J
Work= -22.5 J
This means that a work of 22.5 J must be done in an opposite direction.
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assuming unfirm radiation in all directions find he light intensity in eV/s*m2 at a distance of 1 m from he light source
Light intensity will be approximately 0.0796 eV/s*m2
The intensity of radiation (I) at a distance (r) from a point source of power (P) is given by the inverse-square law:
I = P / (4πr²)
where π is the mathematical constant pi (approximately 3.14159).
Assuming the radiation is in the form of photons with energy E, the light intensity in eV/s*m² can be calculated as follows:
Convert the power P into units of energy/time, where time is measured in seconds:
P = E × N,
where N is the number of photons emitted per second by the source.
Substitute P into the formula for intensity and solve for I:
I = E × N / (4πr²)
Express I in eV/s*m² by dividing by the elementary charge (e):
I (in eV/s*m²) = (E × N / e) / (4πr²)
Assuming a monochromatic source of light with energy E = 1 eV, the number of photons emitted per second N can be calculated from the power of the source using the formula:
N = P / E
Let's assume that the light source has a power of 1 watt (1 J/s), then N = 1 eV/s.
Substituting the values into the formula for intensity, we get:
I = (1 eV/s) / (4π × (1 m)²) = 0.0796 eV/s*m²
Therefore, the light intensity in eV/sm² at a distance of 1 m from a monochromatic source of light with energy E = 1 eV and power 1 watt is approximately 0.0796 eV/sm².
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a force of 1150 N acts parallel to ramp to push a 250 kg gun safe into a moving van. The ramp is frictionless and inclined at 17 degree
a) what is the acceleration of the safe up the ramp?
b) If we consider friction in this problem, with a friction force of 120 N, what is the acceleration of the safe
A force of 1150 N acts parallel to ramp to push a 250 kg gun safe into a moving van. The ramp is frictionless and inclined at 17 degree
a) To find the acceleration of the safe up the ramp,
1. Determine the component of the force parallel to the ramp: F_parallel = 1150 N
2. Calculate the gravitational force acting on the safe along the ramp: F_ gravity = m * g * sin(theta) = 250 kg * 9.81 m/s^2 * sin(17 degrees) ≈ 729.6 N
3. Calculate the net force acting on the safe: F_ net = F_ parallel - F_ gravity = 1150 N - 729.6 N ≈ 420.4 N
4. Use Newton's second law to find the acceleration: F_ net = m * a, so a = F_ net / m = 420.4 N / 250 kg ≈ 1.68 m/s^2
The acceleration of the safe up the ramp is approximately 1.68 m/s^2.
b) To find the acceleration of the safe considering friction, follow these steps:
1. Determine the friction force: F_friction = 120 N
2. Calculate the net force acting on the safe, considering friction: F_net_with_friction = F_parallel - F_gravity - F_friction = 1150 N - 729.6 N - 120 N ≈ 300.4 N
3. Use Newton's second law to find the acceleration with friction: a_with_friction = F_net_with_friction / m = 300.4 N / 250 kg ≈ 1.20 m/s^2
When considering friction, the acceleration of the safe up the ramp is approximately 1.20 m/s^2.
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what electric field strength is needed to create a 6.0 a a current in a 1.7- mm m m -diameter iron wire?
The electric field strength needed to create a 6.0 A current in a 1.7-mm-diameter iron wire is 5.5 x 105 V/m.
The electric field strength needed to create a 6.0 A current in a 1.7-mm-diameter iron wire, we can use Ohm's law, which states that the voltage (V) equals the current (I) multiplied by the resistance (R).
Since the resistance of an iron wire is given by R=ρL/A, where ρ is the resistivity, L is the length of the wire, and A is its cross-sectional area, we can rearrange Ohm's law to get the voltage V=IR.
For the given wire, the cross-sectional area is A=πd2/4, where d is the diameter of the wire, the resistance to be R=ρL/(πd2/4).
V=IR, and rearranging to solve for I, we get I=V/R. The electric field strength needed to create a 6.0 A current in a 1.7-mm-diameter iron wire to be E=V/L=V/(ρL/A)=Vπd2/(4ρL).
The electric field strength needed for a given wire of any diameter and any length. However, for the given parameters, electric field strength to be E=6.0/(1.7 x 10-3 x 10-2/(4 x 10-7 x 8.0))=5.5 x 105 V/m.
The electric field strength needed to create a 6.0 A current in a 1.7-mm-diameter iron wire is 5.5 x 105 V/m.
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for comparison, what is the magnitude of the acceleration a test tube would experience if dropped from a height of 1.0 m and stopped in a 1.1-ms-long encounter with a hard floor?
The magnitude of the acceleration a test tube would experience if dropped from a height of 1.0 m and stopped in a 1.1-ms-long encounter with a hard floor is 9,819.819819819819 m/s².
Acceleration is defined as the rate at which velocity changes with time. Acceleration can be expressed as a vector with both magnitude and direction in physics. It's a scalar quantity in one dimension that only includes magnitude.
It is calculated as the ratio of the difference between the initial (v1) and final (v2) velocities of an object to the time interval (t) during which the velocity difference occurred. It's usually represented as:-
a = (v2 - v1) / t
The magnitude is the size of a vector or the scalar value of a physical quantity (that has a direction). Magnitude is used to describe how big an object or quantity is without taking its direction into account. The magnitude of the acceleration is the rate at which the speed of an object changes.
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determine how much the path of the bullet is altered by the magnetic field after it has traveled 1500 m
The path of the bullet is altered by the magnetic field after it has traveled 1500 m.
Magnetic field is an area in which an object experiences a force because of being placed within it. When the bullet is moved through a magnetic field, it experiences a force that alters its course from a straight line.
The force that a moving charged particle experiences as it travels through a magnetic field is known as the magnetic force.
Because the bullet is moving, the charge in the bullet is experiencing a magnetic force as a result of the magnetic field.The path of the bullet is altered by the magnetic field after it has traveled 1500 m.
The path of the bullet may be altered in various ways depending on the strength of the magnetic field and the velocity of the bullet.
When a magnetic field is generated in the vicinity of the bullet, the bullet's trajectory is modified. The bullet will always curve to the right or left, depending on the direction of the magnetic field.
The force acting on a charge traveling through a magnetic field is proportional to the speed of the charge, the charge on the charge, and the strength of the magnetic field.
Therefore, if a bullet is traveling at a high speed and encounters a strong magnetic field, it will be deflected in a sharp curve, resulting in a significant path deviation.
The path deviation of a bullet moving through a magnetic field after it has traveled 1500 m can be determined using the equation:f = (qVB)/m
where f is the force on the charged particle, q is the charge on the particle, V is the velocity of the particle, B is the magnetic field strength, and m is the mass of the charged particle.
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In the formula v = f X, what measurement is used for the frequency of the wavelength?
v = fλ links the velocity, frequency, and wavelength of a wave and is used to compute one of these parameters if the other two are known.
What unit of measurement is the wavelength's frequency?The wavelength formula shows the wavelength in metres. The v represents wave velocity and is measured in metres per second (mps). In addition, the letter "f" stands for frequency, which is expressed in hertz (Hz).
Which of the following best describes the wavelength measuring unit?The term wavelength implies that it measures length. Its measurements are often expressed in length measurements or metric units. In other words, wavelengths can be expressed in their SI units, metres.
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if a wavelength is 635 nm, what is the frequency? please show all the steps and all of your work when you upload your final answer.
If a wavelength is 635 nm, the frequency is 4.72 × 10¹⁴ Hz.
The frequency of a wavelength is determined by the formula f = c/λ, where f is the frequency, c is the speed of light (3.00 x 108 m/s), and λ is the wavelength.
Given,
Wavelength = 635 nm
To find, frequency
Formula
The velocity of light = Wavelength × Frequency.
C = λ × f
Frequency f = C / λ
Where C = 3 × 10⁸ m/s, λ = 635 nm = 635 × 10⁻⁹ m
∴ f = C / λ
= (3 × 10⁸ m/s) / (635 × 10⁻⁹ m)
= (3 × 10⁸) × (10⁹ / 635)Hz= 4.72 × 10¹⁴ Hz
Frequency = 4.72 × 10¹⁴ Hz
Therefore, the frequency is 4.72 × 10¹⁴ Hz.
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how would stellar parallax observed from neptune differ from the stellar parallax we observe from earth
The difference in the stellar parallax observed from Neptune compared to Earth is the distance from the observer to the star. The further the observer is from the star, the smaller the stellar parallax appears to be.
Stellar parallax is the apparent displacement of the position of a nearby star that takes place as a result of the Earth's motion around the Sun. The measurement of the angle of the parallax allows astronomers to determine the distance of the star from Earth.
On the other hand, Neptune is a planet in our solar system that is located farther from the Sun than Earth. Stellar parallax observed from Neptune would differ from the stellar parallax we observe from Earth because of the planet's location in our solar system.
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determine if the drag force exerted on an object moving through air (a.k.a. force of air resistance) is proportional to the velocity or the square of the velocity of the object.
The drag force exerted on an object moving through air (a.k.a. force of air resistance) is proportional to the square of the velocity of the object.
Thus, the correct answer is proportional to the square of the velocity of the object.
What is the drag force?The аir resistаnce force аcting on аn object moving through аir is referred to аs drаg force. When а body trаvels through а fluid such аs wаter or аir, it fаces resistаnce to its motion, which is proportionаl to the velocity of the object. This resistаnce force аcting on а body moving through аir is referred to аs аir resistаnce or drаg force.
The drаg force on аn object in the аir is proportionаl to the squаre of the object's velocity. When the velocity of the object is doubled, the drаg force becomes four times greаter. Thus, the drаg force grows fаster thаn the object's velocity. In other words, the drаg force аcting on аn object increаses аs the squаre of the object's velocity.
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