The angular acceleration of the person's arm about the shoulder is the greatest when the arm is at its lowest point during the swing, perpendicular to the ground.
The angular acceleration of the arm about the shoulder will be the greatest when the arm is at its lowest point during the swing, which is perpendicular to the ground.
1. The person's arm starts in an initial position that is straight out and parallel to the ground.
2. As the person allows her arm to swing freely, gravitational force causes the arm to accelerate downward.
3. The force acting on the arm is the weight of the arm, which can be considered to act at its center of mass.
4. As the arm moves downward, the torque (rotational force) about the shoulder joint increases due to the increased force of gravity acting on the arm.
5. The angular acceleration is directly proportional to the torque and inversely proportional to the moment of inertia.
In this case, the moment of inertia remains constant as the arm's mass and length remain the same throughout the swing.
6. Therefore, the angular acceleration of the arm will be the greatest when the torque about the shoulder is the largest.
7. The torque will be the largest when the arm is at its lowest point during the swing, which is when it is perpendicular to the ground.
This is because the force of gravity acting on the arm has the most significant impact at this position.
For similar question on acceleration.
https://brainly.com/question/26408808
#SPJ11
an angry rhino with a mass of 2400 kg charges directly toward you with a speed of 4.80 m/s. before you start running, as a distraction, you throw a 0.180 kg rubber ball directly at the rhino with a speed of 7.90 m/s. determine the speed of the ball (in m/s) after it bounces back elastically toward you.
The speed of the ball after it bounces back elastically toward you when throwing a 0.180 kg rubber ball directly at the rhino with a speed of 7.90 m/s is 7.90 m/s.
The formula for elastic collisions is m1v1 + m2v2 = m1v1' + m2v2' where m is the mass, v is the initial velocity, and v' is the final velocity after the collision. In this case, the rhino is massive and the ball is light, so we will assume that the rhino does not change speed after the collision.
We are given:
m1 = 0.180 kgInitial Velocity1 = 7.90 m/sm2 = 2400 kgInitial Velocity2 = 4.80 m/sWe can then solve for the final velocity of the ball:
= m1v1 + m2v2 = m1v1' + m2v2'
⇒ (2400 kg)(4.8 m/s) + (0.18 kg)(7.9 m/s) = (2400 kg)(4.8 m/s) + (0.18 kg)(v2')
⇒ 11,520 kg·m/s + 1.422 kg·m/s = 11,520 kg·m/s + 0.18 kg·v2'
⇒ v2' = (11,520 kg·m/s + 1.422 kg·m/s - 11,520 kg·m/s) / 0.18 kg = 7.90 m/s
Therefore, the speed of the ball after it bounces back elastically toward you is 7.90 m/s.
For more information about elastic collisions refers to the link: https://brainly.com/question/2356330
#SPJ11
what are 2 ways that an unbalanced force can change the motion of an object
Answer:
Unbalanced forces can lead to a change in direction, a change in speed, or both a change in direction and in speed.
Explanation:
at this date and time, the four moons of jupiter appear in the order of their distances from jupiter. which moon will take the least time to orbit jupiter?
While the other moons have periods ranging from 3 to 16 days, Io completes one full orbit of Jupiter in less than 2 days.
Which of Jupiter's moons is the largest and how many of them are Class 3?Jupiter has 67 satellites. A few of them go unnamed. After Galileo Galilei, the four primary groupings of moons are known as the Galilean moons: Europa, Lo, Ganymede, and Callisto. Ganymede is the biggest moon in the solar system.
Why can we see only four of Jupiter's moons?If you only see three or four moons, one of them may be behind or in front of Jupiter. Since the orbits are nearly edge-on when viewed from Earth, the satellites appear to be arranged in a line.
To know more about moons visit:-
brainly.com/question/12550364
#SPJ1
astronauts on the first trip to mars take along a pendulum that has a period on earth of 1.50 s . the period on mars turns out to be 2.45 s. What is the free-fall acceleration onMars? gmars= m/s2
Astronaut on the first trip to mars take along a pendulum that has different period on earth and mars and the free fall acceleration on mars is 3.67m/s².
given:
period on earth T₁ = 1.50 secperiod on mars T₂ = 2.45sec
To calculate free fall acceleration on mars (g₂),
where g₁ free fall acceleration on earth and g₂ free fall acceleration on mars.
The period of the pendulum on the earth is obtained by the equation:
T₁ = 2π√(L/g₁)
The period of the pendulum on the mars is obtained by the equation:
T₂ = 2π√(L/g₂)
On dividing the above equation we get;
T₁/T₂ = √(g₂/g1)
On squaring both the sides,
T₁²/T₂² = g₂/g₁
(1.50)²/(2.45)² = g₂/g₁
g₂ = 2.25/6.0025(9.8)
g₂ = 3.67m/s²
The free fall acceleration g₂ on mars is obtained 3.67m/s².
To know more about free fall acceleration : https://brainly.com/question/31260515
#SPJ12
what is the moment of inertia of the object starting from rest if it has a final velocity of 5.5 m/s? express the moment of inertia as a multiple of mr2 , where m is the mass of the object and r is its radius.
The moment of inertia of an object starting from rest and reaching a final velocity of 5.5 m/s depends on the object's mass, shape, and distribution of mass.
The moment of inertia can be expressed as a multiple of mr², where m is the mass of the object and r is its radius. This is known as the moment of inertia for a solid sphere or cylinder, which have a uniform mass distribution. For example, the moment of inertia for a solid sphere is 2/5mr², while the moment of inertia for a solid cylinder rotating about its central axis is 1/2mr².
To know more about moment of inertia , here
brainly.com/question/15246709
#SPJ4
for a given incident energy of an electromagne;c wave, why is the radia;on pressure on a perfectly reflec;ng surface twice as great as that on a perfectly absorbing surface?
The radiation pressure on a perfectly reflecting surface is twice as great as that on a perfectly absorbing surface because the reflection of an electromagnetic wave causes its momentum to double.
Electromagnetic waves are transverse waves consisting of mutually orthogonal electric and magnetic fields that oscillate with a time-varying amplitude and frequency as they travel through space. EM waves are generated by vibrating charged particles and are propagated through space at the speed of light in a vacuum.
Radiation pressure refers to the pressure exerted on a surface due to the impact of electromagnetic radiation. It is an expression of the momentum transfer of photons to a surface. Incident energy refers to the energy carried by an electromagnetic wave that strikes a surface or object. It is proportional to the amplitude of the wave and the duration of the pulse.
The radiation pressure on a perfectly reflecting surface is twice as great as that on a perfectly absorbing surface for a given incident energy of an electromagnetic wave because the reflection of an electromagnetic wave causes its momentum to double. When an EM wave is absorbed by a surface, the momentum of its photons is entirely transferred to the surface, resulting in the exertion of a force on the surface equivalent to the momentum of the photons.
The reflection of an EM wave, on the other hand, doubles the momentum of the wave, resulting in a greater force being exerted on the surface. Hence, the radiation pressure on a perfectly reflecting surface is twice as great as that on a perfectly absorbing surface.
Learn more about Electromagnetic waves at: https://brainly.com/question/3101711
#SPJ11
During take off, a plane leaves the ground and
travels in a straight line until it reaches a
height of 10 km. The distance the plane flies
during take off should be in the range 57 km
to 62 km.
What is the smallest possible angle that the
path of the plane could make with the ground?
Give your answer in degrees to 1 d.p.
Not drawn accurately
Explanation:
please mark as brainliest answer
The smallest possible angle that the path of the plane could make with the ground is 18.9 degrees.
We are given that the plane travels a distance of 57 km to 62 km during take off, and that it reaches a height of 10 km. We want to find the smallest possible angle that the path of the plane could make with the ground.
The smallest possible angle will occur when the plane travels the maximum distance of 62 km..
To calculate the angle, we can use the following formula:
sin(theta) = opposite / hypotenuse
sin(theta) = 10 / 62
theta = sin⁻¹(10/62) = 18.9 degrees
As a result, the least conceivable angle that the plane's path might create with the ground is 18.9 degrees.
To know more about the Distance, here
https://brainly.com/question/16564973
#SPJ2
Seafloor spreading occurs because ____.
Select one:
a.
new material is being added to the asthenosphere
b.
earthquakes break apart the ocean floor
c.
sediments accumulate at the area of spreading
d.
molten material beneath Earth's crust rises to the surface
Answer:
Seafloor spreading occurs because earthquakes break apart the ocean floor.
What is the seafloor spreading theory?
Seafloor spreading is a geologic process where there is a gradual addition of new oceanic crust in the ocean floor through a volcanic activity while moving the older rocks away from the mid-oceanic ridge. The mid-ocean ridge is where the seafloor spreading occurs, in which tectonic plates—large slabs of Earth’s Lithosphere—split apart from each other.
Seafloor spreading was proposed by an American geophysicist, Harry H. Hess in 1960. By the use of the sonar, Hess was able to map the ocean floor and discovered the mid-Atlantic ridge (mid-ocean ridge). He also found out that the temperature near to the mid-Atlantic ridge was warmer than the surface away from it. He believed that the high temperature was due to the magma that leaked out from the ridge. The Continental Drift Theory of Alfred Wegener in 1912 is supported by this hypothesis on the shift position of the earth’s surface.
The Process of Sea Floor SpreadingThe mid-ocean ridge is the region where new oceanic crust is created. The oceanic crust is composed of rocks that move away from the ridge as new crust is being formed. The formation of the new crust is due to the rising of the molten material (magma) from the mantle by convection current. When the molten magma reaches the oceanic crust, it cools and pushes away the existing rocks from the ridge equally in both directions.
A younger oceanic crust is then formed, causing the spread of the ocean floor. The new rock is dense but not as dense as the old rock that moves away from the ridge. As the rock moves, further, it becomes colder and denser until it reaches an ocean trench or continues spreading.
It is believed that the successive movement of the rocks from the ridge progressively increases the ocean depth and have greater depths in the ocean trenches. Seafloor spreading leads to the renewal of the ocean floor in every 200 million years, a period of time for building a mid-ocean ridge, moving away across the ocean and subduction into a trench.
#SPJ1
How is electric force related to charge?
A. Inversely related to charge
B. Directly related to charge
C. Weaker when closer to a sphere
D. Conservative
Electric force is directly related to charge.
According to Coulomb's law, the electric force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. This means that if the charge on one of the objects increases, the electric force between them will also increase proportionally, assuming the distance between them remains the same.
Therefore, the correct answer is:
B. Directly related to charge.
[tex] \: [/tex]
Think about tug of war. Team X has three members who pull with the following forces: +180 N, +200 N, and +190 N. Team Y has three members who pull with the following forces: -200 N, -180 N, and -191 N. Which team would win?
In tug of war, the team that pulls with the greater force wins. The net force acting on each team is the sum of the forces acting on each member of the team. In this case,
Team X has a net force of +570 N (180 N + 200 N + 190 N), while Team Y has a net force of -571 N (-200 N - 180 N - 191 N). Since Team X has a net force in the positive direction and Team Y has a net force in the negative direction, it means that Team X would win the tug of war. The difference between the net forces of the two teams is 1 N, which means that Team X would win by a very small margin. Therefore, the team with the greater net force wins, regardless of the number of members on each team. Team X has three members who pull with the following forces: +180 N, +200 N,
learn more about forces here:
https://brainly.com/question/13191643
#SPJ4
2. Calculate the IMA of a compound machine made of a lever with an input arm of 9 cm and an output arm of 3 cm and an inclined plane with length 6 m and height 0.5 m.
The output force to the input force of a compound machine is the IMA (Ideal Mechanical Advantage), assuming no energy losses from friction.
What is the inclined plane show's IMA?The run-to-rise ratio, also known as the ideal mechanical advantage (IMA) of an inclined plane, is the length of the inclination divided by the vertical rise. When the slope of the incline reduces, the mechanical advantage grows, but the weight must be transported over a longer distance.
IMA lever equals input arm length minus output arm length (9 cm minus 3 cm equals three).
6 metres divided by 0.5 metres yields 12 in the formula for the IMA inclined plane.
Assume we have a 100 N object in our possession. We can calculate the force necessary to raise the object up the inclined plane using the IMA of the lever:
100 N / 3 = 33.33 N force lever = weight of item / IMA lever
IMA inclined plane = 33.33 N / 12 = 2.78 N, where force inclined plane = force lever
Force lever: 100 N / 33.33 N = 3 IMA compound machine: output force / input force / weight of item
To know more about force visit:-
https://brainly.com/question/13191643
#SPJ1
for a satellite to be in a circular orbit 850 km above the surface of the earth, what orbital speed must it be given?
the orbital speed of the satellite in a circular orbit 850 km above the surface of the Earth is approximately 7,663 m/s.
To determine the orbital speed of a satellite in a circular orbit, we can use the following formula:
v = √(GM/r)
Where v is the orbital speed, G is the gravitational constant[tex](6.674 x 10^-11 m^3/kg*s^2)[/tex], M is the mass of the Earth [tex](5.97 * 10^24 kg)[/tex], and r is the distance from the center of the Earth to the satellite (850 km + the radius of the Earth, which is approximately 6,378 km).
First, we need to convert the distance to meters:
r = 850,000 m + 6,378,000 m = 7,228,000 m
Plugging in the values, we get:
v = √[tex]((6.674 * 10^-11 m^3/kg*s^2) * (5.97 * 10^24 kg) / (7,228,000 m))[/tex]
Simplifying the equation, we get:
v = 7,663 m/s
Therefore, the orbital speed of the satellite in a circular orbit 850 km above the surface of the Earth is approximately 7,663 m/s.
This high speed is necessary to keep the satellite in orbit, as it must balance the force of gravity with its own centrifugal force. If the satellite were traveling too slowly, it would be pulled back towards the Earth by gravity, and if it were traveling too quickly, it would escape Earth's gravitational pull and fly off into space.
To know more about circular orbit,click here:
brainly.com/question/29679142
#SPJ4
in what is known as ___, jupiter and venus appeared close together in the night sky.
In what is known as a conjunction, Jupiter and Venus appear to be passing each other quite close together in the night sky.
In Los Angeles In what is known as a conjunction, Jupiter and Venus appear to be passing each other quite close together in the night sky.
The amount of light reflected by each planet varies. Certain planets' composition and atmosphere prevent them from reflecting a significant amount of light. Yet, extremely dense clouds of gases and sulfuric acid surround Venus. Sunlight easily reflects off of these clouds, causing them to reflect light. Almost 75% of the sunlight that hits Venus' surface is reflected.
In addition, Venus is quite visible because it is so close to the Earth. It is in a good location for reflecting sunlight towards the earth and being quite visible because it is somewhat close to the Sun (although Mercury is closest to the Sun).
Learn more about Jupiter and Venus here
https://brainly.com/question/20984718
#SPJ1
6. The approach to development LEAST likely to
result in sprawl is
a. leapfrog development.
b. commercial (strip) development.
c. high-density multi-use development.
d. low-density single-use development.
The approach to development least likely to result in sprawl is: C. high-density multi-use development.
What is sprawl?Sprawl is characterized by the spread of low-density, single-use development over a large area, often in a decentralized pattern. This type of development is typically associated with automobile-dependent land use patterns and long commuting distances, which contribute to traffic congestion, air pollution, and a variety of other negative environmental and social impacts.
High-density multi-use development, on the other hand, typically involves compact, mixed-use development patterns that encourage walking, biking, and public transit use. This type of development is designed to minimize the need for automobile travel and to create more walkable, livable communities.
Leapfrog development, commercial (strip) development, and low-density single-use development are all types of development patterns that are more likely to contribute to sprawl than high-density multi-use development.
Therefore the correct option is C.
Learn more about density here:https://brainly.com/question/1354972
#SPJ1
what is the direction of the net momentum? express your answer in degrees measured clockwise from the north to the west.
Make sure your calculator is in degree mode.
The direction of the net momentum is θ degrees measured clockwise from the north to the west.
To determine the direction of the net momentum, follow these steps:
Step 1: Identify the momentum components
Since the question does not provide specific information about the magnitudes or directions of the individual momenta, let's assume that we have two momenta: momentum A pointing north, and momentum B pointing west.
We can represent them as vector quantities A and B, respectively.
Step 2: Find the horizontal (westward) and vertical (northward) components of the net momentum
The horizontal component of the net momentum is the westward momentum (momentum B).
The vertical component of the net momentum is the northward momentum (momentum A).
Step 3: Use the Pythagorean theorem to find the magnitude of the net momentum
The magnitude of the net momentum (C) can be found by using the Pythagorean theorem: [tex]C^2 = A^2 + B^2.[/tex]
Take the square root of both sides to find the magnitude of the net momentum: [tex]C = sqrt(A^2 + B^2).[/tex]
Step 4: Use trigonometry to find the direction of the net momentum
To find the direction of the net momentum, we need to calculate the angle between the net momentum and the north direction, measured clockwise.
We can use the tangent function in trigonometry for this purpose: tan(θ) = B/A,
where θ is the angle between the net momentum and the north direction.
Step 5: Calculate the angle in degrees
To find the angle in degrees, take the inverse tangent (arctan) of the ratio B/A: θ = arctan(B/A).
For similar question on direction.
https://brainly.com/question/29248951
#SPJ11
suppose we change the tires of our jaguar xkr to a smaller diameter, and that the speedometer is set to read the linear speed of the jaguar xkr by measuring the angular speed of the tires. how will this affect the speedometer reading when compared to the true linear speed of the jaguar xkr?
If the tires of the Jaguar XKR are changed to a smaller diameter, the speedometer will read a higher linear speed than the actual speed of the Jaguar XKR.
Linear speed is the speed at which an object travels in a straight line. A speedometer is a device that is utilized to measure the speed of a vehicle. The angular speed of the wheels is determined by the speedometer.To calculate the linear speed of the Jaguar XKR, the speedometer measures the angular speed of the wheels. The speedometer's reading will be higher than the true linear speed of the Jaguar XKR if the tires are switched to a smaller diameter.
The angular speed of the smaller tires is greater than the angular speed of the bigger tires. The smaller tires revolve more times per minute than the larger tires. This leads to a higher speedometer reading when compared to the true linear speed of the Jaguar XKR.
Learn more about speedometer and speed at: https://brainly.com/question/29098798
#SPJ11
The picture above shows a sound wave. If the distance from A to B was increased, the pitch of the sound would
The sound's pitch would decrease as the distance from point A to point B increased.
What does a sound's pitch mean?When a sound is played, its pitch—how high or low it is—is known.A sound with a high pitch is known as a high sound, and a sound with a low pitch is known as a low sound. In the illustration above, as the distance grows, the pitch will decrease.How does a sound wave change as the pitch rises?Pitch and frequency are connected, therefore as pitch rises, so does frequency, which reduces wavelength. Hence, the relationship between wave frequency and wave velocity is straightforward. Raising the pitch raises.For more information on sound wave kindly visit to
https://brainly.com/question/14588741
#SPJ1
Measurements that are closely grouped around the mean are __________. What one word completes this sentence?
Measurements that are closely grouped around the mean are precise.
What is consistency of measurements?When measurements are closely grouped around the mean, it means that the data points are clustered together and are not spread out widely.
This indicates that the measurements are consistent and that the values are similar to one another. This consistency in the measurements is what we refer to as precision.
In other words, precision refers to the degree of closeness of individual measurements to each other. The more precise the measurements, the less variation there is between the individual data points.
Learn more about mean at:
https://brainly.com/question/20118982
#SPJ1
Answer:"precise"
Explanation:
Precision is different from accuracy. Measurements that are very close to each other, but not close to the true value would be precise, but not accurate.
A person sitting in an artificial satellite of the earth feels weightlessness, but a person standing on moon has weight through the moon is a satellite of the earth. Why?
if the star sirius rises at 8:00 p.m. tonight, at what time will it rise tomorrow night, to the nearest minute? group of answer choices 7:44 pm 7:48 pm 7:52 pm 7:56 pm 8:00 pm 8:04 pm
Sirius will rise tomorrow night at approximately 7:56 p.m., to the nearest minute, if it rose at 8:00 p.m. tonight since each successive rise occurs about 4 minutes earlier.
Sirius is the brightest star in the Earth's night sky and is part of the constellation Canis Major. The timing of when Sirius rises and sets can vary depending on the observer's location and the time of year. However, assuming a 24-hour day and negligible atmospheric refraction, Sirius will rise approximately four minutes earlier each night. This is due to the Earth's rotation and its orbit around the sun, causing the stars to appear to shift in the night sky. Therefore, if Sirius rises at 8:00 p.m. tonight, it will rise approximately four minutes earlier tomorrow night, at around 7:56 p.m. This gradual shift in the timing of star rises and sets is a fundamental concept in astronomy and celestial navigation.
learn more about Sirius here:
https://brainly.com/question/29388328
#SPJ4
when a light source is moving away from the observer, what happens to the observed light? (there may be more than one correct answer.)
The observed light will appear dimmer and will have its wavelength stretched, resulting in a decrease in frequency and an increase in energy. The light's color will also shift towards the red end of the spectrum. This phenomenon is known as the Doppler Effect.
When a light source moves away from an observer, the observed light appears to have a longer wavelength. This phenomenon is known as redshift.
Redshift is the phenomenon in which the light of an object is shifted towards the longer wavelength end of the spectrum when it is moving away from an observer. This shift is due to the Doppler effect, which causes an increase in the wavelength of light from a moving light source. As the speed of light remains constant, the frequency of light decreases as the wavelength increases. This can be observed in the light of galaxies that are moving away from us. The light from these galaxies appears redder than it would if the galaxies were stationary. This is because the light is being shifted towards the longer wavelength, red end of the spectrum. The amount of redshift is proportional to the speed of the object and the distance it is from the observer.
Learn more about Doppler effect:
https://brainly.com/question/1330077
#SPJ11
what is the correct relation if the standard heat solution of calcium chloride CaCI2 salt equals -120 kJ/mol
The correct relation for the standard heat solution of calcium chloride CaCl2 salt can be expressed as:
ΔH°soln(CaCl₂) = -120 kJ/mol
Here, ΔH°soln(CaCl₂) represents the standard heat of solution of calcium chloride, which is the amount of heat absorbed or released when one MOLE of calcium chloride is dissolved in water under standard conditions (25°C and 1 atm pressure). The negative sign indicates that the process is exothermic, meaning that heat is released when the salt dissolves in water. The value of -120 kJ/mol represents the magnitude of the heat released per mole of CaCl₂ dissolved in water.
To know more about standard heat please refer:
https://brainly.com/question/29555412
#SPJ1
Assume the motions and currents mentioned are along the x axis and fields are in the y direction.(a) Does an electric field exert a force on a stationary charged object? Yes/No(b) Does a magnetic field do so? Yes/No
Yes, an electric field exerts a force on a stationary charged object. This is because the electric field is composed of electric lines of force that travel in a straight line and exert a force upon the stationary charged object.
The magnitude of the force depends on the strength of the electric field and the charge on the object. No, a magnetic field does not exert a force on a stationary charged object. This is because a magnetic field is composed of magnetic lines of force that travel in circles and therefore do not exert a force on a stationary object.
However, a magnetic field does exert a force on a moving charged object, such as a current-carrying wire. This force is known as the Lorentz force, which is a combination of both electric and magnetic forces.
Know more about Lorentz force here
https://brainly.com/question/15552911#
#SPJ11
when the capacitor is connected to a battery with voltage 500.0 v , the electric field between the plates is 83 % of the dielectric strength. what is the area of each plate if the capacitor stores 0.250 mj of energy under these conditions? express your answer with the appropriate units.
The area of each plate if the capacitor stores 0.250 mJ of energy under these conditions is 3.82 x 10^-4 m^2.
When the capacitor is connected to a battery with voltage 500.0 V, the electric field between the plates is 83% of the dielectric strength. The area of each plate if the capacitor stores 0.250 mJ of energy under these conditions can be calculated as follows: Voltage V = 500V, Electric field E = 83% of dielectric strength, Energy stored E = 0.250 mJ. We know that the Energy stored by a capacitor is given by ,E = 1/2 CV²Where C is the capacitance of the capacitor, V is the voltage across the capacitor.
Area of the plate of the capacitor is given by, A = C / ε0Where ε0 is the permittivity of free space. Substituting E = 1/2 CV², we get0.25 × 10⁻³ J = 1/2 C × (500 V)²C = (2 × 0.25 × 10⁻³) / (500)²F. Now, the capacitance C is given as C = Aεr / d, Where A is the area of the plates, εr is the relative permittivity, and d is the distance between the plates.
Substituting the value of capacitance in the above equation, we get A = C d / εrε0
Substituting the values of C, E, and d in the above equation we get, A = (3.85 × 10⁻¹² × (1.5 × 10⁻³)) / (83/100 × 8.85 × 10⁻¹²)
To know more about capacitor, refer here:
https://brainly.com/question/17176550#
#SPJ11
2. For timet> 0 in seconds, a police car is patrolling a local street. The position along
the straight, flat road is given in meters by the function P(t)=25t. Directly ahead
of the police car, a bank robber's getaway car begins to speed up to leave the scene
of the crime. The getaway car's position along the road is given in meters by the
function G(t)=75+2.5. Graph the functions P and G on the same set of axes. What
conclusion can you draw? Does the police car catch the getaway car? Determine the
time at which the police car intersects the getaway car, or determine how close the
police car gets to the getaway car before the bank robber evades capture.
Answer:
The position of the police car along the road is given by the function P(t) = 25t. The position of the getaway car along the road is given by the function G(t) = 75 + 2.5t.
To determine if and when the police car intersects with the getaway car, we can set P(t) equal to G(t) and solve for t: P(t) = G(t) 25t = 75 + 2.5t 22.5t = 75 t = 3.33 seconds
So, after approximately 3.33 seconds, the police car will intersect with the getaway car.
Earth is closer to the sun in December than it is in July. What happens to the orbital speed of the planet between July and December? Explain your answer
The Earth's orbital speed increases slightly as it gets closer to the Sun, reaching its fastest speed in December, and decreases slightly as it moves away from the Sun, reaching its slowest speed at aphelion in July.
What is orbital speed?
The orbital speed of the Earth changes slightly as it moves around the Sun due to changes in its distance from the Sun. As the Earth gets closer to the Sun, it experiences a stronger gravitational pull, which increases its speed, and as it moves farther away from the Sun, the gravitational pull decreases, causing the speed to decrease.
In July, the Earth is at aphelion, which is the farthest point in its orbit from the Sun. At this point, the Earth is about 94.5 million miles away from the Sun. In December, the Earth is at perihelion, which is the closest point in its orbit to the Sun. At this point, the Earth is about 91.5 million miles away from the Sun. Therefore, the Earth is about 3 million miles closer to the Sun in December than it is in July.
As the Earth gets closer to the Sun, its orbital speed increases due to the stronger gravitational pull from the Sun. Therefore, in December, the Earth is moving faster in its orbit around the Sun than it is in July. This increase in speed is not noticeable to us on Earth, but it is a measurable change in the velocity of the Earth's orbit. In fact, the Earth's speed at perihelion is about 30 km/s (18.64 mi/s) compared to about 29.29 km/s (18.21 mi/s) at aphelion.
Learn more about orbital speed here: https://brainly.com/question/22247460
#SPJ1
In 1924, Prince Louis de Broglie suggested that all moving particles demonstrate wave-like
behaviour.
a) State the de Broglie equation and define all the symbols.
b) Neutrons may be used to study the atomic structure of matter. Diffraction effects are
noticeable when the de Broglie wavelength of the neutrons is comparable to the spacing
between the atoms. This spacing is typically 2.6 x 10-10 m.
i. Suggest why using neutrons may be preferable to using electrons when investigating
matter.
ii.
Calculate the speed (v) of a neutron having a de Broglie wavelength of
2.6 x 10-¹0 m. The mass of a neutron is 1.7 x 10-27 kg.
a) The de Broglie equation is λ = h/mv, where λ is the wavelength of a particle, h is Planck's constant (6.626 x 10^-34 J s), m is the mass of the particle, and v is its velocity.
b) Neutrons may be preferable to electrons when investigating matter because neutrons have a higher penetrating power than electrons and can pass through thicker samples. Neutrons also interact differently with matter than electrons, allowing them to provide unique information about the atomic structure of materials.
To calculate the speed of a neutron with a de Broglie wavelength of 2.6 x 10^-10 m, we can rearrange the de Broglie equation to solve for v:
v = h/(mλ)
Plugging in the values, we get:
v = (6.626 x 10^-34 J s) / (1.7 x 10^-27 kg x 2.6 x 10^-10 m)
v = 1.56 x 10^3 m/s
Therefore, the speed of the neutron is approximately 1.56 x 10^3 m/s.
3.consider two elastic collisions: 1) a golf ball with speed v hits a stationary bowling ball head-on 2) a bowling ball with speed v hits a stationary golf ball head-on in which case does the golf ball have the greater speed after the collision?
Given two elastic collisions; A golf ball with speed v hits a stationary bowling ball head-on and a bowling ball with speed v hits a stationary golf ball head-on. The golf ball have the greater speed after the collision is the first case (A golf ball with speed v hits a stationary bowling ball head-on).
When two elastic bodies collide, the relative speed between them after the collision is equal to the relative speed before the collision. However, the final velocities of the colliding bodies will depend on their masses. In this case, the mass of the bowling ball is more significant than that of the golf ball. Therefore, in the second case, the golf ball will not bounce as fast as in the first case. The coefficient of restitution (e) measures the fraction of relative speed between the two colliding objects after the collision, compared to the relative speed before the collision.
For an elastic collision, the coefficient of restitution is one, which means the relative speed before and after the collision is the same.The following equation can be used to calculate the final velocities: Vf1=(m1−m2/m1+m2) V1+(2m2/m1+m2) V2Vf2=(2m1/m1+m2) V1+(m2−m1/m1+m2) V2where V1 and V2 are the initial velocities of the two objects, m1 and m2 are their masses, and Vf1 and Vf2 are their final velocities.
Learn more about collision at:
https://brainly.com/question/24616147
#SPJ11
a crate rests in the rough bed of a truck. when the truck accelerates to the left at a constant rate, what is the direction of the friction force acting on the crate? (you can assume that the crate doesn't slip in the bed of the truck.)
The friction force acting on the crate will be in the opposite direction to the acceleration of the truck.
The friction force is opposite, because an unbalanced force, such as acceleration, will result in a friction force in the opposite direction. This is known as the Law of Inertia. The magnitude of the friction force will be dependent on the coefficient of friction between the crate and the truck bed, as well as the weight of the crate.
Assuming that the crate does not slip in the bed of the truck, then the friction force will always oppose the acceleration and will remain constant, even if the acceleration increases or decreases. This is because the static friction between the crate and the bed of the truck is much greater than the kinetic friction, and the static friction is only exceeded when the acceleration becomes too great for it to resist.
In summary, when the truck accelerates to the left at a constant rate, the friction force acting on the crate will be in the opposite direction to the acceleration of the truck. This force will remain constant until the acceleration becomes too great for the static friction to resist.
For more such questions on Friction force.
https://brainly.com/question/30280752#
#SPJ11
a closed-loop system has sustained oscillations (i.e. constant amplitude) with a period of 66 seconds when the gains are: proportional
A closed-loop system has sustained oscillations (i.e., constant amplitude) with a period of 66 seconds when the gains are proportional and integral.
A closed-loop system is a type of control system in which the output is fed back into the system to regulate the input. In this way, the output controls the input. A closed-loop system is a type of feedback control system that includes a controller, a plant, and a sensor. The closed-loop system's sustained oscillations occur due to the interaction between the plant, sensor, and controller. The oscillations are a result of the feedback loop's positive feedback, which amplifies the input and causes it to oscillate.
In a closed-loop system, the gains of the controller play a critical role in determining the oscillations' characteristics. The period of oscillation in a closed-loop system is the time taken for one complete cycle of oscillation. The period of oscillation is measured in seconds. The question states that the closed-loop system has a period of 66 seconds, which implies that it takes 66 seconds to complete one cycle of oscillation. Proportional and integral gains are the two types of gains utilized in a closed-loop system's controller. Proportional gain is the direct relationship between the output and the input. Integral gain, on the other hand, is the error signal's integral over time.
By adding these two gains, the controller may regulate the plant to create the desired output. The fact that the closed-loop system has sustained oscillations with a period of 66 seconds when the gains are proportional and integral implies that the system's feedback loop is stable. In other words, the feedback loop is generating constant oscillations with a fixed period, which is a sign of a stable system.
Learn more about closed-loop systems at brainly.com/question/23250715
#SPJ11