An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s2 and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?

A) 6.0 s B) 8.0 s C) 10 s D) 12 s A) 6.0 s B) 8.0 s C) 10 s D) 12 s

A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s. At the end of this time, what is its velocity?

A) 15 m/s B) 30 m/s C) 45 m/s D) 375 m/s A) 15 m/s B) 30 m/s C) 45 m/s D) 375 m/s

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?

A) 15 s B) 30 s C) 45 s D) 4.2 s A) 15 s B) 30 s C) 45 s D) 4.2 s

Exam 2: Motion in One Dimension

Two identical objects A and B fall from rest from different heights to the ground. If object B takes twice as long as object A to reach the ground, what is the ratio of the heights from which A and B fell? Neglect air resistance.

(Multiple Choice)

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Question 121

A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?

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Question 122

A toy rocket is launched vertically from ground level at time t = 0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 49.0 m and acquired an upward velocity of $60.0 \mathrm {~m} / \mathrm { s }$ The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The maximum height reached by the rocket is closest to

(Multiple Choice)

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Question 123

A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity?

(Multiple Choice)

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Question 124

Two cars are traveling at the same speed and hit the brakes at the same time. Car A decelerates (decreases its velocity) at twice the rate of car B. If car A travels a distance D before stopping, how far does car B travel before stopping?

(Multiple Choice)

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Question 125

If the velocity of an object is zero at one instant, what is true about the acceleration of that object? (There could be more than one correct choice.)

(Multiple Choice)

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Question 126

A car is traveling north at $17.7 \mathrm {~m} / \mathrm { s }$ After 12 s its velocity is $14.1 \mathrm {~m} / \mathrm { s }$ in the same direction. Find the magnitude and direction of the car's average acceleration.

(Multiple Choice)

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Question 127

An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s² and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?

(Multiple Choice)

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Question 128

A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance?

(Multiple Choice)

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Question 129

The graph in the figure shows the position of a particle as a function of time as it travels along the x-axis. (a) What is the magnitude of the average velocity of the particle between t = 1.0 s and t = 4.0 s? (b) What is the average speed of the particle between t = 1.0 s and t = 4.0 s?

(Short Answer)

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Question 130

A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s² for 15 s. At the end of this time, what is its velocity?

(Multiple Choice)

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Question 131

At the same moment, one rock is dropped and one is thrown downward with an initial velocity of $29 \mathrm {~m} / \mathrm { s }$ from the top of a building that is $300 \mathrm {~m}$ tall. How much earlier does the thrown rock strike the ground? Neglect air resistance.

(Short Answer)

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Question 132

A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s?

(Multiple Choice)

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Question 133

Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds

(Multiple Choice)

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Question 134

A toy rocket is launched vertically from ground level at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 64 m and acquired an upward velocity of $60 \mathrm{~m} / \mathrm{s}$ The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The time interval during which the rocket engine provided the upward acceleration, is closest to

(Multiple Choice)

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Question 135

The graph in the figure shows the velocity of a particle as it travels along the x-axis. (a) In what direction (+x or -x) is the acceleration at t = 0.5 s? (b) In what direction (+x or -x) is the acceleration at t = 3.0 s? (c) What is the average acceleration of the particle between t = 2.0 s and t = 4.0 s? (d) At what value of t is the instantaneous acceleration equal to 0 m/s²?

(Short Answer)

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Question 136

A car increases its forward velocity uniformly from 40 m/s to 80 m/s while traveling a distance of 200 m. What is its acceleration during this time?

(Multiple Choice)

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Question 137

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s². How much time is required for the car to reach a speed of 90 km/h?

(Multiple Choice)

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Question 138

An auto accelerates forward from 7.0 m/s at a uniform 0.71 m/s². It travels a distance of 1.033 km while accelerating. (a) How fast is the auto moving just as it is traveled the 1.033 km? (b) How many seconds did it take to travel the 1.033 km?

(Short Answer)

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Question 139

An airplane needs to reach a forward velocity of $203.0 \mathrm {~km} / \mathrm { h }$ to take off. On a $2000 - \mathrm { m }$ runway, what is the minimum uniform acceleration necessary for the plane to take flight if it starts from rest?

(Multiple Choice)

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Question 140

Showing 121 - 140 of 174

Exam 2: Motion in One Dimension

Two identical objects A and B fall from rest from different heights to the ground. If object B takes twice as long as object A to reach the ground, what is the ratio of the heights from which A and B fell? Neglect air resistance.

A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?

A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity?

Two cars are traveling at the same speed and hit the brakes at the same time. Car A decelerates (decreases its velocity) at twice the rate of car B. If car A travels a distance D before stopping, how far does car B travel before stopping?

If the velocity of an object is zero at one instant, what is true about the acceleration of that object? (There could be more than one correct choice.)

A car is traveling north at 17.7 m/s17.7 \mathrm {~m} / \mathrm { s }17.7 m/s After 12 s its velocity is 14.1 m/s14.1 \mathrm {~m} / \mathrm { s }14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration.

An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s2 and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?

A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance?

The graph in the figure shows the position of a particle as a function of time as it travels along the x-axis. (a) What is the magnitude of the average velocity of the particle between t = 1.0 s and t = 4.0 s? (b) What is the average speed of the particle between t = 1.0 s and t = 4.0 s?

A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s. At the end of this time, what is its velocity?

At the same moment, one rock is dropped and one is thrown downward with an initial velocity of 29 m/s29 \mathrm {~m} / \mathrm { s }29 m/s from the top of a building that is 300 m300 \mathrm {~m}300 m tall. How much earlier does the thrown rock strike the ground? Neglect air resistance.

A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s?

Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds

A car increases its forward velocity uniformly from 40 m/s to 80 m/s while traveling a distance of 200 m. What is its acceleration during this time?

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?

An auto accelerates forward from 7.0 m/s at a uniform 0.71 m/s2. It travels a distance of 1.033 km while accelerating. (a) How fast is the auto moving just as it is traveled the 1.033 km? (b) How many seconds did it take to travel the 1.033 km?

An airplane needs to reach a forward velocity of 203.0 km/h203.0 \mathrm {~km} / \mathrm { h }203.0 km/h to take off. On a 2000−m2000 - \mathrm { m }2000−m runway, what is the minimum uniform acceleration necessary for the plane to take flight if it starts from rest?

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A car is traveling north at $17.7 \mathrm {~m} / \mathrm { s }$ After 12 s its velocity is $14.1 \mathrm {~m} / \mathrm { s }$ in the same direction. Find the magnitude and direction of the car's average acceleration.

An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s² and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?

A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s² for 15 s. At the end of this time, what is its velocity?

At the same moment, one rock is dropped and one is thrown downward with an initial velocity of $29 \mathrm {~m} / \mathrm { s }$ from the top of a building that is $300 \mathrm {~m}$ tall. How much earlier does the thrown rock strike the ground? Neglect air resistance.

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s². How much time is required for the car to reach a speed of 90 km/h?

An auto accelerates forward from 7.0 m/s at a uniform 0.71 m/s². It travels a distance of 1.033 km while accelerating. (a) How fast is the auto moving just as it is traveled the 1.033 km? (b) How many seconds did it take to travel the 1.033 km?

An airplane needs to reach a forward velocity of $203.0 \mathrm {~km} / \mathrm { h }$ to take off. On a $2000 - \mathrm { m }$ runway, what is the minimum uniform acceleration necessary for the plane to take flight if it starts from rest?