The image that you see through a converging lens when the lens is close to your eyeball and you look at a close object is virtual and enlarged.
When an object is held close to the eye and seen via a converging lens, the image seems magnified and virtual. An expanded and upright virtual picture is created when the lens bends the incoming light rays so that they converge and seem to come from a point behind the lens. The distance between the lens and the item being seen as well as the focal length of the lens affect the distance of the image from the lens.
To examine a close item, it may not be the best practice to hold a lens too close to the eye as this might strain and hurt the eye. For this reason, a magnifying glass or another optical device could be better suitable.
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how does quantum mechanics differ from classical mechanics in the way a state of a physical system is mathematically represented? why is this conceptually significant?
Quantum mechanics uses a mathematical structure called a wave function to describe the state of a system, while classical mechanics use a set of variables, such as position and momentum.
This is how quantum mechanics differs from classical mechanics in the way the state of a physical system is represented mathematically. Instead of describing the exact state of a particle, the wave function explains the probability of finding a particle in a given state.
The principle of superposition states that particles have no apparent state until they are detected, which alludes to its theoretical importance. It affects how we perceive the fabric of reality and how small entities behave.
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2. An olympic diver dives (no jumping) off a 10m high springboard, into the water below. Once
the diver hits the water, their velocity decreases uniformly and they come to a stop 1.5
seconds after they enter the water. How deep was the diver when they came to a stop?
What was the rate of acceleration in the water?
The diver was 10.425m deep when they came to a stop and the rate of acceleration in the water was [tex]-9.4m/s^2[/tex].
Given the height of springboard from water (h) = 10m
Time after which the diver comes to a stop = 1.5s
Let the depth the diver reached in water = d
The final velocity after he reaches the depth (v) = 0m/s
Lett the speed of diver after free fall until he reaches water = um/s
According to Newtons laws of motion we know that [tex]v^2 - u^2 = 2gh[/tex]where g is the acceleration due to gravity = [tex]9.8m/s^2[/tex] then:
[tex]0^2 - u^2 = 2*(-9.8)*(10)[/tex]
[tex]u^2 = 196 \\u = \sqrt{196} = 14m/s[/tex]
The initial velocity with which the diver reaches water surface = 14m/s
The rate of acceleration in the water can be calculated using the equation:
a = (Vf - Vi) / t where Vf is the final velocity, Vi is the initial velocity, and t is the time it takes for the diver to come to a stop.
[tex]a = (0 - 14)/1.5 = -9.4 m/s^2[/tex]
Then the distance the diver travelled in water before coming to rest is calculated as below:
[tex]s = ut + 1/2at^2[/tex] then:
[tex]d = 14 * 1.5 - 1/2 * (-9.4) * 1.5 * 1.5[/tex]
d = 21 - 10.575 = 10.425m
Therefore, the depth of the diver when they came to a stop was 10.425m
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a 920 kg sports car collides into the rear end of a 2300 kg suv stopped at red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.8 meters before stopping. coefficient of friction between tires and road is .80. calculate the speed of the sports car at impact?
The speed of the sports car at impact is 9.37 m/s.
The conservation of momentum and the work-energy principle using here . Before the collision, the two cars are not moving, so their initial momentum is zero. Let v be the speed of the sports car after the collision.
Using the conservation of momentum, we have:
(m1 + m2) * v = m1 * v1
where m1 and m2 are the masses of the sports car and the SUV, respectively, and v1 is the initial velocity of the sports car before the collision.
After the collision, the two cars move together and stop after skidding a distance of 2.8 meters. can use the work-energy principle to relate the work done by the frictional force to the change in kinetic energy of the two cars. The work done by the frictional force is given by:
W = F * d = μ * N * d
where μ is the coefficient of friction, N is the normal force, and d is the distance over which the frictional force acts. The normal force is equal to the weight of the two cars, which is:
N = (m₁ + m₂) × g
where g is the acceleration due to gravity.
The change in kinetic energy of the two cars is:
ΔK = (1/2) × (m¹ + m²) × v²
Using the work-energy principle, we have:
W = ΔK
μ × N × d = (1/2) × (m1 + m2) × v²
Substituting the expressions for N and μ, we get:
μ × (m₁+ m₂) × g × d = (1/2) × (m1 + m2) × v²
Simplifying and solving for v, we get:
v = √(2 × μ × g ×d)
Substituting the given values, we get:
v = √(2 × 0.8 × 9.81 m/s² × 2.8 m) = 9.37 m/s
Therefore, the speed of the sports car at impact would be 9.37 m/s.
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A car acquires velocity of 72km/h
in 10s starting from start.. Calculate it's average velocity, acceleration and distance travelled during this period.
Answer:
Avg. Velocity = 10 m/s
Acceleration = 2 m/s^2
Distance = 100 m
Explanation:
First, we need to convert the velocity of the car from km/h to m/s, since the standard unit of velocity in SI units is meters per second.
72 km/h = 20 m/s (to 2 significant figures)
We can now calculate the average velocity of the car using the formula:
average velocity = total distance ÷ total time
Since the car starts from rest, its initial velocity is 0 m/s. Therefore, the total distance it travels during the 10 seconds is:
distance = (1/2) × acceleration × time²
where acceleration is the constant acceleration of the car during the 10 seconds, which we do not know yet.
To find the acceleration, we can use the formula:
final velocity = initial velocity + acceleration × time
The final velocity of the car is 20 m/s (which we calculated earlier), the initial velocity is 0 m/s, and the time is 10 seconds. Therefore:
20 m/s = 0 m/s + acceleration × 10 s
Solving for acceleration:
acceleration = 2 m/s²
Substituting this value of acceleration into the formula for distance, we get:
distance = (1/2) × 2 m/s² × (10 s)² = 100 meters
Therefore, the average velocity of the car during the 10 seconds is:
average velocity = total distance ÷ total time = 100 meters ÷ 10 seconds = 10 m/s
The acceleration of the car during the 10 seconds is 2 m/s², and the distance travelled by the car during this period is 100 meters.
Two gases x and y are found in the atmosphere in only trace amounts because they decompose quickly. when exposed to ultraviolet light the half-life of x is 0.75h, while that of y is 90.min. suppose an atmospheric scientist studying these decompositions fills a transparent 5.0l flask with x and y and exposes the flask to uv light. initially, the partial pressure of x is 3.0 times greater than the partial pressure of y. will the partial pressure of x ever be lower than y. if so at what time will it be lower?
The partial pressure of gas x will be lower than gas y after 2.25 hours (2 hours and 15 minutes).Therefore, option C is correct.
Yes, the partial pressure of gas x will be lower than gas y after 2.25 hours (2 hours and 15 minutes).[tex]What is the given information in the problem[/tex]?The following information is given in the problem:Two gases x and y are found in the atmosphere in only trace amounts because they decompose quickly.The half-life of x is 0.75 hThe half-life of y is 90 min (1.5 h)The initial partial pressure of x is 3 times greater than yThe total volume of the flask is 5.0 L.[tex]How can we approach the problem?[/tex]We will use the half-life formula and the partial pressure formula to solve the problem.The half-life formula is:t1/2 = 0.693/kHere, k is the first-order rate constant.The partial pressure formula is:P = nRT/VHere,P is the partial pressuren is the number of molesR is the universal gas constantT is the temperatureV is the volume of the flask.Method:First, we will find the first-order rate constant k for both gases using the half-life formula.Then, we will use the partial pressure formula to find the number of moles of both gases x and y in the flask using the given partial pressure and the total volume of the flask.Finally, we will use the first-order rate constant and the number of moles to find the partial pressure of gases x and y at a given time.Let's solve the problem.Steps:1. Find the first-order rate constant k for gas x.t1/2 (x) = 0.75 hUsing the half-life formula,t1/2 = 0.693/kk(x) = 0.693/t1/2 (x)k(x) = 0.693/0.75k(x) = 0.924 h-12. Find the first-order rate constant k for gas y.t1/2 (y) = 90 min = 1.5 hUsing the half-life formula,t1/2 = 0.693/kk(y) = 0.693/t1/2 (y)k(y) = 0.693/1.5k(y) = 0.462 h-13. Find the initial number of moles of gas x in the flask.Partial pressure of x = 3 * Partial pressure of yP(x) = 3 * P(y)P(x) = (3/4) * Total pressure of x and yP(y) = Total pressure of x and yP(x) + P(y) = Total pressure of x and yLet's assume that the total pressure of x and y is P0.P0 = P(x) + P(y)P(x) = (3/4) * P0P(y) = (1/4) * P04. Find the initial number of moles of gas y in the flask.P(y) = n(y)RT/Vn(y) = P(y) * V/RTn(y) = [(1/4) * P0 * 5.0 L] / [(0.0821 L atm K-1 mol-1) * (298 K)]n(y) = 0.062 mol5. Find the initial number of moles of gas x in the flask.P(x) = n(x)RT/Vn(x) = P(x) * V/RTn(x) = [(3/4) * P0 * 5.0 L] / [(0.0821 L atm K-1 mol-1) * (298 K)]n(x) = 0.186 mol6. Find the partial pressure of gas x after 1 hour.P(x, 1 h) = n(x)k(x)tP(x, 1 h) = (0.186 mol) * (0.924 h-1) * (1 h)P(x, 1 h) = 0.171 atm7. Find the partial pressure of gas y after 1 hour.P(y, 1 h) = n(y)k(y)tP(y, 1 h) = (0.062 mol) * (0.462 h-1) * (1 h)P(y, 1 h) = 0.028 atm8. Find the partial pressure of gas x after 2 hours.P(x, 2 h) = n(x)k(x)tP(x, 2 h) = (0.186 mol) * (0.924 h-1) * (2 h)P(x, 2 h) = 0.342 atm9. Find the partial pressure of gas y after 2 hours.P(y, 2 h) = n(y)k(y)tP(y, 2 h) = (0.062 mol) * (0.462 h-1) * (2 h)P(y, 2 h) = 0.049 atm10. Find the partial pressure of gas x after 2.25 hours.P(x, 2.25 h) = n(x)k(x)tP(x, 2.25 h) = (0.186 mol) * (0.924 h-1) * (2.25 h)P(x, 2.25 h) = 0.383 atm11. Find the partial pressure of gas y after 2.25 hours.P(y, 2.25 h) = n(y)k(y)tP(y, 2.25 h) = (0.062 mol) * (0.462 h-1) * (2.25 h)P(y, 2.25 h) = 0.052 atmConclusion:Yes.
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how does the linear speed of a child sitting near the center of a rotating merry-go-round compare with that of a dog sitting near the edge of the same merry-go-round?
The linear speed of a child sitting near the center of a rotating merry-go-round is less than the linear speed of a dog sitting near the edge of the same merry-go-round.
Speed is a fundamental concept that refers to how fast an object is moving. It is defined as the distance covered by an object in a given amount of time. The concept of speed is important in many areas of physics, including kinematics, dynamics, and thermodynamics. It is often used to describe the motion of objects, such as cars, airplanes, and particles.
In physics, there are two types of speed: scalar speed and vector speed. Scalar speed is the magnitude of the velocity vector and is measured in units of distance per unit of time. Vector speed, on the other hand, is the speed of an object in a specific direction and is measured in units of distance per unit of time in that direction.
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if it gains sufficient mass from a binary companion, a white dwarf can become a if it gains sufficient mass from a binary companion, a white dwarf can become a brown dwarf. type i supernova. black dwarf. planetary nebula. type ii supernova.
If a white dwarf gains sufficient mass , it can undergo a type I supernova. This occurs when the white dwarf reaches Chandrasekhar limit, which is approximately 1.4 times mass of the Sun.
If a white dwarf does not gain sufficient mass to undergo a type I supernova, it will eventually cool down and become a black dwarf. A brown dwarf is a failed star that is not massive enough to undergo nuclear fusion in its core, and so it emits very little light or heat.
A type II supernova occurs when a massive star runs out of fuel and its core collapses, leading to a catastrophic explosion. This is distinct from a type I supernova, which involves a white dwarf.
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during the scientific revolution, astronomer and mathematician nicolaus copernicus' book on the revolutions of the heavenly spheres would have directly challenged the ideas in what previous book?
During the Scientific Revolution, astronomer and mathematician Nicolaus Copernicus' book "On the Revolutions of the Heavenly Spheres" directly challenged the ideas in the book "Almagest" by Claudius Ptolemy.
In the scientific revolution, Nicolaus Copernicus' book on the revolutions of the heavenly spheres would have directly challenged the ideas in the previous book which was Ptolemy's Almagest.
Copernicus challenged the geocentric model of the universe, which was the dominant view at the time, and replaced it with the heliocentric model, which stated that the sun, rather than the earth, was the center of the universe.
This directly challenged the ideas put forth in Ptolemy's Almagest, which had been the standard text on astronomy for over a thousand years.
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you are swinging a yo-yo around in a circle above your head. assume this is a perfect system: the mass of the string is negligible, the yo-yo is a point mass and your arm is a perfectly vertical axis of rotation.given the mass of the yo-yo is m and the length of the string (radius of the circle traced by the yo-yo) is l, you find the moment of inertia to be i. if you double the length of the string, what is the new moment of inertia?
if you double the length of the string, the new moment of inertia is 4 times the initial moment of inertia.
When a yo-yo is swung around in a circle above the head, and it is assumed that it is a perfect system with negligible mass of the string, the yo-yo is a point mass, and the arm is a perfectly vertical axis of rotation, the moment of inertia can be given as `I = ml²`,
where, I is The moment of inertia for a point mass m placed a distance l from the axis of rotation. This formula is based on the assumption that the point mass rotates along an axis perpendicular to the plane of motion.
If the length of the string (radius of the circle traced by the yo-yo) is doubled, the new moment of inertia can be calculated as follows:
I' = m(2l)²
I' = m4l²
Therefore, the new moment of inertia is `4ml²`.
Thus, the new moment of inertia is 4 times the initial moment of inertia.
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a leading model of galactic recycling holds that gas is blown high above the disk of the galaxy by supernovae and eventually cools and rains back down into the disk. this model is called
The leading model of galactic recycling that involves gas being blown high above the disk of the galaxy by supernovae and eventually cooling and raining back down into the disk is called the galactic fountain model.
The galactic fountain model describes a cycle in which gas in the disk of a galaxy is heated and ejected by supernovae explosions, which create a hot, low-density gas that rises above the disk. Over time, this gas cools and falls back towards the disk, where it can be used to form new stars and fuel ongoing star formation.
This process is thought to play a key role in regulating the rate of star formation in galaxies, as well as in determining the chemical composition of the interstellar medium. The galactic fountain model has been supported by observations of gas kinematics and chemical abundances in the Milky Way and other galaxies. It is an important framework for understanding the complex interplay between stellar evolution, gas dynamics, and galaxy formation and evolution.
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with what minimum speed must you toss a 150 g ball straight up to just touch the 14- m -high roof of the gymnasium if you release the ball 1.7 m above the ground? solve this problem using energy.
The minimum speed required to toss the ball straight up to just touch the roof of the gymnasium is 6.35 m/s.
To calculate the minimum speed required to toss a 150 g ball straight up to just touch the 14 m high roof of the gymnasium, we can use energy conservation. The potential energy of the ball when it is at the release point is given by mgh, where m is the mass of the ball, g is the acceleration due to gravity, and h is the height of the release point above the ground. At the release point, the ball has zero kinetic energy.
When the ball just touches the roof, its potential energy is zero, and all its initial potential energy has been converted into kinetic energy. The kinetic energy of the ball can be expressed as (1/2)mv^2, where v is the velocity of the ball at the point of contact with the roof.
Therefore, we can write the equation: mgh = (1/2)mv²
Rearranging the equation, we get: v = sqrt(2gh)
Substituting the given values, we get: v = sqrt(2 x 9.81 m/s^2 x (14 m - 1.7 m)) = 6.35 m/s
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bubba is driving along at a speed of 23.1 m/s. he has a barrel of feed in the back of his truck. the barrel is not secured in any way. the coefficient of static friction between the barrel and the bed of the truck is 0.296. the road near bubba's farm curves. what is the sharpest radius of curvature turn that bubba can drive at this speed before the barrel of feel starts to slide in the bed of the truck?
The sharpest radius of curvature turn that Bubba can drive at this speed before the barrel starts to slide in the bed of the truck is approximately 183.8 meters.
To find the sharpest radius of curvature turn that Bubba can drive at this speed before the barrel starts to slide in the bed of the truck, we need to use the following formula:
f_s ≤ m * a / N
where f_s is the coefficient of static friction (0.296), m is the mass of the barrel, a is the centripetal acceleration, and N is the normal force. Since the barrel is not accelerating vertically, the normal force (N) equals the gravitational force (mg). The centripetal acceleration (a) can be calculated using the formula:
a = v^2 / r
where v is the speed (23.1 m/s) and r is the radius of curvature. Now, we can plug these equations into the inequality:
0.296 ≤ (23.1^2) / (r * g)
where g is the gravitational acceleration (9.81 m/s²). We need to solve for r:
0.296 * r * 9.81 ≤ 23.1^2
2.90176 * r ≤ 533.61
r ≥ 533.61 / 2.90176
r ≥ 183.8 m
The sharpest radius of curvature turn that Bubba can drive at this speed before the barrel starts to slide in the bed of the truck is approximately 183.8 meters.
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If a truck with a frequency of 85.0 Hz is traveling toward an observer with a speed of 27.0 m/s, what frequency does the observer hear as the truck approaches?
Mattie wanted to measure the speed of sound through different materials. Mattie planned to use the table shown to record data.
Speed of Sound Through
Different Materials
Material Speed of Sound
Block of aluminum
Balloon filled with air
Tank filled with water
Tank filled with oil
Through which material will Mattie most likely find that sound travels the fastest?
Through the block of aluminum material, Mattie will most likely find that sound travels the fastest.
The correct answer is block of aluminum.
The speed of sound in a medium refers to the rate at which sound waves propagate through the medium. When you bang a drum, the sound waves produced move through the air until they reach your ears, allowing you to hear the sound.
The speed of sound varies depending on the medium through which it passes. In solids and liquids, sound travels faster than in gases.
Mattie wants to measure the speed of sound through different materials, and she planned to use the table shown to record data. The table below shows the speed of sound through different materials. Material Speed of Sound Block of aluminum 6,000 m/s Balloon filled with air 340 m/s Tank filled with water 1,500 m/s Tank filled with oil 1,200 m/s
Therefore, through the block of aluminum material, Mattie will most likely find that sound travels the fastest.
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a ball is attached to the end of a string. it is swung in a vertical circle of radius 1.33 m. what is the minimum velocity that the ball must have to make it around the circle?.
Answer:
v = 3.61210464965 m/s
Explanation:
∑F = ma
Centripetal acceleration is mv^2/r and the ball is under a force of gravity
[tex]F=ma\\\\mg = \frac{mv^2}{r}\\\\v=\sqrt{gr} \\\\v=\sqrt{(9.81m/s^2)(1.33m)} \\\\v=3.61210464965m/s[/tex]
The minimum velocity that the ball must have to make it around the vertical circle is 3.66 m/s.
When the ball is swung in a vertical circle, there are two forces acting on the ball, which are the gravitational force and the tension force in the string. When the velocity of the ball is minimum, the gravitational force will be equal to the tension force in the string.
The centripetal force is also equal to the gravitational force. This can be expressed mathematically as:
[tex]\frac{mv^2}{R} = mg + T[/tex]
Where m is the mass of the ball, v is its velocity, R is the radius of the vertical circle, g is the acceleration due to gravity, and T is the tension force in the string. Rearranging the formula gives:
[tex]v^2 = Rg + R*(\frac{T}{m})[/tex]
We can see that the minimum velocity of the ball is achieved when T is minimum. At the top of the circle, T is minimum, which means:
[tex]v^2 = Rg[/tex]
So, [tex]v = \sqrt{(Rg)} = \sqt{(1.33 * 9.81)} = 3.66[/tex] m/s
Therefore, the minimum velocity that the ball must have to make it around the vertical circle is 3.66 m/s.
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the velocity of waves on a string is 89 m/s . part a if the frequency of standing waves is 470 hz , how far apart are two adjacent nodes?
The distance between two adjacent nodes of the standing wave is approximately 0.0947 m.
The distance between two adjacent nodes of a standing wave on a string can be calculated using the formula:
d = λ/2
where d is the distance between two adjacent nodes, and λ is the wavelength of the wave.
We can calculate the wavelength of the wave using the formula:
v = f λ
where v is the velocity of the wave, f is the frequency of the wave, and λ is the wavelength of the wave.
Substituting the given values, we get:
λ = v/f
λ = 89 m/s / 470 Hz
λ = 0.1894 m
Now, we can calculate the distance between two adjacent nodes as:
d = λ/2
d = 0.1894 m / 2
d = 0.0947 m
Therefore, the distance between two adjacent nodes of the standing wave is approximately 0.0947 m.
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a nearsighted person has her vision corrected using a 2.75-diopter contact lens. contact lenses are placed on the eyeball so the distance from the eye to the object (or image) is the same as the distance from the lens to that object (or image). what is her near point using this lens? question 1 options: 40 cm 20 cm 80 cm 100 cm
The near point of this person's vision is approximately 36.36 cm. So the near point will be option 40 cm.
If we have to find the near point of a person's vision, we need the closest distance at which an object can be brought into focus on the retina.
Here about this case, a nearsighted person has her vision corrected using a 2.75-diopter contact lens. This means that the image is shifted forward and brought into focus on the retina.
The formula for near point of an eye is:
Near point = 1/f
where f is the power of the lens in diopters.
So, the near point of the nearsighted person with the 2.75-diopter contact lens is:
Near point = 1/2.75
Near point = 0.3636 meters = 36.36 cm
Therefore, the near point of the person's vision is approximately 36.36 cm, which is closest to the option 40 cm.
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Waves Problem set *use units*
1.A tall, thin tree sways back and forth in the breeze with a frequency of 58.0 Hz. What is the period of the tree?
2.A periodic transverse wave that has a frequency of 24.9 Hz, travels along a string. The distance between the crest and the adjacent trough is 3.4 m. What is its wavelength?
3.What is the speed of a sound wave that has a frequency of 285 Hz and a wavelength of 1.5 m?
4.A person yells across a canyon and hears the echo 5.5 seconds later. If the speed of sound is 336.0 m/s, how far away is the other side of the canyon?
5.Radio station WKLB in Boston broadcasts at a frequency of 97.1 kHz. What is the wavelength of the radio waves emitted by WKLB? ( Radio waves travel at the speed of light 3x108 m/s) ps. no decimals
6. Water waves at a lake cross a distance of 7 m in 3.9 s. The period of oscillation is 3 s. What is the speed of the water waves?
7.Water waves at a lake cross a distance of 9 m in 2.9 s. The period of oscillation is 3.1 s. What is the wavelength of the water waves?
8.One pulse is generated every 0.84 s in a tank of water. What is the frequency of the pulses?
9. One pulse is generated every 0.95 s in a tank of water. What is the speed of propagation of the wave if the wavelength of the surface wave is 1.9 cm?
10.Dog whistles are inaudible to humans because dogs can hear at much higher frequencies than humans are capable of detecting. If a dog whistle has a wavelength of 2.3 x 10-3 m, what is the frequency of sound emitted? *Sound travels at 340 m/s.
11. What is the speed of sound in air that has a temperature of 29.2 o C?
12. What is the wavelength of sound in air that has a temperature of 7.9 o C has a frequency of 40.7 Hz?
To solve problems involving waves, it's important to know the relationships between frequency, wavelength, and speed, which are given by the formulas v = f λ and T = 1/f, where v is the speed of the wave, f is the frequency, λ is the wavelength, and T is the period of oscillation.
The period of the tree is T=1/f= 1/58.0 Hz = 0.0172 s.
The wavelength of the wave is λ = 2 (crest to trough distance) = 2 (3.4 m) = 6.8 m.
The speed of the sound wave is v = f λ = (285 Hz) (1.5 m) = 427.5 m/s.
The distance to the other side of the canyon is d = (speed of sound) × (time for echo to return) / 2 = (336.0 m/s) × (5.5 s) / 2 = 924 m.
The wavelength of the radio waves emitted by WKLB is λ = c / f = 3 x 10^8 m/s / 97.1 x 10^3 Hz = 3.09 m.
The speed of the water waves is v = λ / T = (7 m) / (3 s) = 2.33 m/s.
The wavelength of the water waves is λ = v T = (2.9 s) (2.33 m/s) = 6.74 m.
The frequency of the pulses is f = 1/T = 1/0.84 s = 1.19 Hz.
The speed of the wave is v = λ / T = (1.9 cm) / (0.95 s) = 2 cm/s.
The frequency of the sound wave is f = v / λ = 340 m/s / 2.3 x 10^-3 m = 1.48 x 10^5 Hz.
The speed of sound in air at 29.2°C is v = 331 m/s + (0.6 m/s/°C) × (29.2°C) = 349.5 m/s.
The wavelength of the sound wave is λ = v / f = (331 m/s + (0.6 m/s/°C) × (7.9°C)) / (40.7 Hz) = 8.06 m.
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two train tracks are going in opposite directions leave at the same time. one train travels 80km/hr and the other travels 70km/hour. how long after they leave will they me 50km apart
Answer:
20 min
Explanation:
let the time taken be t
s = distance by train 1 + distance by train 2
s= 50 km
by the second equation of motion,
[tex]s=\frac{1}{2} at^2+ut[/tex]
a in both trains is zero.
so,
50= 80t + 70t
50= 150t
t= 1/3 hr = 20 min
The first equation of motion: v = u + at
Second equation of motion: s = ut + 12 at2
Third equation of motion: v2 = u2 + 2as
where,
s = displacement
u = initial velocity
v = final velocity
a = acceleration
t = time of motion
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The two trains will be 50km apart after 1/3 of an hour, which is equivalent to 20 minutes.
Two train tracks are going in opposite directions leave at the same time. One train travels 80km/hr and the other travels 70km/hour.
When two train tracks are going in opposite directions and leave at the same time, they are moving apart from each other. In this case, one train is moving at 80 km/hour, and the other is moving at 70 km/hour. Therefore, the relative speed of the two trains is 80 km/hour + 70 km/hour = 150 km/hour.
To determine the time it takes for the trains to be 50 km apart, we use the formula:
d = rt
Where, d = distance, r = rate (speed), and t = time
So, 50 = 150t (since the distance is 50 km and the relative speed is 150 km/hour). Solving for t, we get:
[tex]t = \frac{50}{150} = \frac{1}{3}[/tex] hours = 20 minutes.
Therefore, the two trains will be 50 km apart after 20 minutes of leaving.
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Someone help me pls!!!
Answer:
Student 2 (B)
Explanation:
ignore the explanation I need 20 characters to add an answer
when a transparency sheet is rubbed with a tissue and the transparency and tissue are then held at rest a short distance apart, group of answer choices the two objects exert magnetic forces on each other, because electrons are rubbed off of one and onto the other. the two objects exert electric forces on each other, because the electron orbits in the two objects are all put into the same alignment. the transparency and the tissue exert magnetic forces on each other, because the electron orbits in the two objects are all put into the same alignment. a spark will jump between them, because the rubbing causes electrons to jump from one object to the other. the two objects exert electric forces on each other, because electrons are rubbed off of one and onto the other.
When a transparency sheet is rubbed with a tissue and the transparency and tissue are then held at rest a short distance apart the two objects exert electric forces on each other because electrons are rubbed off of one and onto the other. The correct option is "the two objects exert electric forces on each other, because electrons are rubbed off of one and onto the other."
When a transparency sheet is rubbed with a tissue, the two objects develop electric charges. The tissue becomes negatively charged as a result of this rubbing because electrons are transferred from the transparency sheet to the tissue.
As a result, the transparency sheet becomes positively charged. These charges create electric forces that cause the two objects to be attracted to one other.
As a result, they exert electric forces on each other. Therefore, the most appropriate answer to the given question is that the two objects exert electric forces on each other because electrons are rubbed off of one and onto the other.
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there is no current in the circuit shown until the switch is closed. how much current goes through the 20 ohm resistor the isntant
Current flowing through the circuit when the switch is closed will be I = 10V/30 ohms = 1/3 A (0.333 A)
The potential difference across the 20 ohm resistor is equal to the voltage of battery, 10V. According to Ohm's law, current flowing through the circuit will be determined by the total resistance in the circuit and the voltage supplied by the battery.
So, the current flowing through the circuit when the switch is closed will be I = 10V/30 ohms = 1/3 A (0.333 A). This same current of 1/3 A will flow through the 20 ohm resistor as well, as there is only one path for the current to flow through the circuit.
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a student is making a cup of hot chocolate. they want to add hot chocolate mix to water to make a 60% solution of hot chocolate. If they have 100 units of water, how many units of hot chocolate mix is there?
The student needs to add 150 units of hot chocolate mix to 100 units of water to make a 60% solution of hot chocolate.
What is Solution?
Solutions can be made of different states of matter such as gases, liquids, and solids. The concentration of the solute in a solution can be expressed in different ways, including mass percentage, mole fraction, and molarity.
Let x be the number of units of hot chocolate mix needed to make a 60% solution.
We know that the final volume of the solution will be 100 + x units.
Since the solution is 60% hot chocolate mix, we can set up the following equation:
x / (100 + x) = 0.6
Multiplying both sides by (100 + x), we get:
x = 0.6 (100 + x)
Distributing the 0.6, we get:
x = 60 + 0.6x
Subtracting 0.6x from both sides, we get:
0.4x = 60
Dividing both sides by 0.4, we get:
x = 150
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how does the period obtained when the cylinder is suspended by a thread compare with its period when placed in the pan
The period of oscillation of the cylinder in the pan will be affected by the properties of the fluid, such as its density and viscosity, which will not affect the motion of the suspended cylinder.
The formula for the period of oscillation of a cylinder in a fluid is given by:
T = 2π√(I/mgd)
Viscosity describes the internal friction between different layers of a fluid as they move past one another. High-viscosity fluids, such as molasses or honey, flow slowly and require more force to move, while low-viscosity fluids, such as water, flow more easily and quickly.
Viscosity is influenced by several factors, including temperature, pressure, and the size and shape of molecules in the fluid. For example, as the temperature of a fluid increases, its viscosity typically decreases, and as pressure increases, viscosity may increase. Viscosity is important in many areas of science and engineering, such as in the study of fluid dynamics, lubrication, and materials science. It also plays a role in various industrial applications, such as in the production of paints, cosmetics, and food products.
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a mass-spring system oscillates with a period of 2.2 s. what would be the period of the system if the mass and the spring constant were both increased by a factor of four? a. the period would decrease by half b. the period would remain the same c. the period would be multiplied by the square root of two d. the period would double
A mass-spring system oscillates with a period of 2.2 s. If both the mass and the spring constant are increased by a factor of four, the period of the system will remain the same. Here option B is the correct answer.
The period of a mass-spring system is given by:
T = 2π √(m/k)
where T is the period, m is the mass of the object attached to the spring, and k is the spring constant.
If both the mass and spring constant is increased by a factor of four, the new period can be calculated as:
T' = 2π √(4m/4k) = 2π √(m/k)
Since the mass and spring constant are increased by the same factor, their ratio remains the same, and the expression simplifies to the original equation for the period.
Therefore, the period of the system would remain the same if both the mass and spring constant were increased by a factor of four.
This result can be understood intuitively by considering that increasing the mass would increase the inertia of the system while increasing the spring constant would increase the force required to move the mass. These effects would cancel out and result in the same period of oscillation.
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binoculars contain prisms inside that reflect light entering at an angle largerthan the critical angle. if the index of refraction of a glass prism is 1.58, what is the critical angle for light entering the prism?
The critical angle for light to penetrate a glass prism with a 1.58 index of refraction is 40.2 degrees.
The formula for calculating the critical angle is sin(critical angle) = 1/n, where n is the medium's coefficient of refraction.
The critical angle can be determined using the formula sin(critical angle) = 1/1.58 for a glass prism with an index of refraction of 1.58.
Criterion angle sin = 0.6329 When we take the inverse sine of both edges,
Taking the inverse sine of both sides, we get:
critical angle = sin^-1(0.6329)
critical angle = 40.2 degrees
As a result, 40.2 degrees is the critical angle for light to penetrate a glass prism with a 1.58 index of refraction.
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A 0.155 kg arrow is shot from
ground level, upward at 31.4 m/s.
What is its potential energy (PE)
when it is 30.0 m above the
ground?
The potential energy of the arrow when it is 30.0 m above the ground is 45.57 J.
What is the potential energy (PE) of the arrow when it is 30.0 m above the ground?The potential energy (PE) of an object at a height h is given by the formula:
PE = mgh
Where m is the mass of the object, g is the acceleration due to gravity ( 9.8m/s²), and h is the height.
Given that:
m = 0.155 kg
v = 31.4 m/s
h = 30.0 m
g = 9.81 m/s² (acceleration due to gravity)
Use the formula for potential energy to find the potential energy of the arrow at a height of 30.0 m:
PE = mgh
PE = 0.155 × 9.8 × 30.0
PE = 45.57 J
Therefore, the potential energy of the arrow is 45.57 J.
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a magnetic field increases from 0 to 0.37 t in 1.5 s . part a how many turns of wire are needed in a circular coil 13 cm in diameter to produce an induced emf of 7.5 v ?
A magnetic field increases from 0 to 0.37 t in 1.5 s . 2917 turns of wire are needed in a circular coil 13 cm in diameter to produce an induced emf of 7.5 v
To find the number of turns of wire needed in the circular coil, we'll use Faraday's law of electromagnetic induction:
emf = -N x (ΔB x A) / Δt
Where emf is the induced electromotive force (7.5 V), N is the number of turns of wire, ΔB is the change in magnetic field (0.37 T), A is the area of the circular coil, and Δt is the time taken (1.5 s).
First, let's find the area of the circular coil:
A = π x [tex](d/2)^2[/tex]
A = π x [tex](0.13 \:m / 2)^2[/tex]
A ≈ 0.0132 m²
Now, we'll rearrange Faraday's law equation to solve for N:
N = -emf x Δt / (ΔB x A)
N = -7.5 V x 1.5 s / (0.37 T x 0.0132 m²)
N ≈ -14.25 / 0.004884
N ≈ 2916.57
Since the number of turns of wire must be a whole number, we can round it up to the nearest whole number:
N ≈ 2917 turns
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Does anyone know this???
The wavelength of the wave of speed 35 m/s is 1.75 m.
What is wavelength?Wavelength is the distance taken by a wave to cover one complete cycle.
To calculate the wavelength of the wave, we use the formula below
Formula:
λ = v/f......................... Equation 1Where:
λ = Wavelength of the wavev = Velocity of the wavef = Frequency of the waveFrom the question,
Given:
v = 35 m/sf = 20 HzSubstitute these values into equation 1
λ = 35/20λ = 1.75 mHence, the wavelength of the wave is 1.75 m.
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changing the inner radius automatically changes the angular velocity to 36 degrees / s. why? (make sure to mention moment of inertia and angular momentum in your answer.)
Changing the inner radius automatically changes the angular velocity to maintain the conservation of angular momentum. Changing the inner radius of a rotating object changes its moment of inertia, which is a measure of its resistance to rotational motion.
The moment of inertia depends on the distribution of mass within the object, as well as the shape and size of the object. In this case, since the angular velocity changes to 36 degrees per second, we can conclude that the moment of inertia of the rotating object has increased.
According to the conservation of angular momentum, the product of the moment of inertia and angular velocity remains constant for a rotating object. Mathematically, we can express this principle as:
I1 x ω1 = I2 x ω2
Where I1 and I2 are the initial and final moments of inertia, and ω1 and ω2 are the initial and final angular velocities, respectively.
In this scenario, if we increase the inner radius of the rotating object, its moment of inertia will increase. Since the angular momentum must remain constant, the angular velocity must decrease to compensate for the increase in moment of inertia. Similarly, if we decrease the inner radius, the moment of inertia will decrease, and the angular velocity must increase to conserve angular momentum.
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