Question 1

Find the tension in an elevator cable if the 1000-kg elevator is ascending with an acceleration of 1.2 m/s2, upward.

Accepted Answer

A)  11,000 N 
B)  9800 N 
C)  8600 N 
D)  1200 N 
A)  11,000 N 
B)  9800 N 
C)  8600 N 
D)  1200 N A

Question 2

As a car skids with its wheels locked trying to stop on a road covered with ice and snow, the force of friction between the icy road and the tires will usually be:

Accepted Answer

A)  greater than the normal force of the road times the coefficient of static friction. 
B)  equal to the normal force of the road times the coefficient of static friction. 
C)  less than the normal force of the road times the coefficient of static friction. 
D)  greater than the normal force of the road times the coefficient of kinetic friction. 
A)  greater than the normal force of the road times the coefficient of static friction. 
B)  equal to the normal force of the road times the coefficient of static friction. 
C)  less than the normal force of the road times the coefficient of static friction. 
D)  greater than the normal force of the road times the coefficient of kinetic friction. C

Question 3

A room has 110 ft2 of floor space. What is the approximate volume of the room? (You will need to make a reasonable estimate of a missing physical quantity.)

Accepted Answer

A)  103 ft3 
B)  104 ft3 
C)  105 ft3 
D)  106 ft3 
A)  103 ft3 
B)  104 ft3 
C)  105 ft3 
D)  106 ft3 A

Question 4

A cue ball of weight W is falling with an acceleration downward of g/3 and speed v. What is the magnitude of the drag force on the ball at this moment?

Accepted Answer

A)  0.33W 
B)  0.67W 
C)  0.11W 
D)  There is insufficient information to solve this problem. 
A)  0.33W 
B)  0.67W 
C)  0.11W 
D)  There is insufficient information to solve this problem.

Question 5

A stone is thrown downward from a cliff. Take "up" to be the positive direction. Which of the following statements is true about the stone?

Accepted Answer

A)  The velocity is negative, the acceleration is negative, and the speed is negative. 
B)  The velocity is positive, the acceleration is negative, and the speed is positive. 
C)  The velocity is negative, the acceleration is negative, and the speed is positive. 
D)  The velocity is positive, the acceleration is positive, and the speed is positive. 
A)  The velocity is negative, the acceleration is negative, and the speed is negative. 
B)  The velocity is positive, the acceleration is negative, and the speed is positive. 
C)  The velocity is negative, the acceleration is negative, and the speed is positive. 
D)  The velocity is positive, the acceleration is positive, and the speed is positive.

Question 6

A speeding car traveling at a constant velocity of 24 m/s passes a police care initially at rest beside the roadway. If the police car with constant acceleration of   immediately pursues the speeding car, how far down the road does it draw even with the speeding car?

Accepted Answer

A)  190 m 
B)  290 m 
C)  380 m 
D)  770 m 
A)  190 m 
B)  290 m 
C)  380 m 
D)  770 m

Question 7

A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 4.0 m/s2. What is the magnitude of the cart's displacement during the first 6.0 s of its motion?

Accepted Answer

A)  10 m 
B)  55 m 
C)  66 m 
D)  102 m 
A)  10 m 
B)  55 m 
C)  66 m 
D)  102 m

Question 8

The coefficient of friction between a racecar's wheels and the track is 1.0. The car starts from rest and accelerates at a constant rate for 300 m. Find the maximum speed at the end of the race.

Accepted Answer

A)  44 m/s 
B)  77 m/s 
C)  89 m/s 
D)  99 m/s 
A)  44 m/s 
B)  77 m/s 
C)  89 m/s 
D)  99 m/s

Question 9

A ball rolls down an incline, starting from rest. If the total time it takes to reach the end of the incline is T, how much time has elapsed when it is halfway down the incline?

Accepted Answer

A)  0.5T 
B)   0.5T 
D)  More information is needed. 
A)  0.5T 
B)   0.5T 
D)  More information is needed.

Question 10

Starting from rest, a car accelerates down a straight road with constant acceleration a1 for a time t1, then the acceleration is changed to a different constant value a2 for an additional time t2. The total elapsed time is t1 + t2. Can the equations for motion with constant acceleration be used to find the total distance traveled?

Accepted Answer

A)  No, because this is not a case of constant acceleration. 
B)  Yes, use (a1 + a2)/2 as the average acceleration and the total time in the calculation. 
C)  Yes, use a1 + a2 as the acceleration and the average time (t1 + t2)/2 in the calculation. 
D)  Yes, break the problem up into 2 problems, one with the conditions for the first time interval and the other with the conditions for the second time interval, noting that for the second time interval the initial velocity is that from the end of the first time interval. When done, add the distances from each of the time intervals. 
A)  No, because this is not a case of constant acceleration. 
B)  Yes, use (a1 + a2)/2 as the average acceleration and the total time in the calculation. 
C)  Yes, use a1 + a2 as the acceleration and the average time (t1 + t2)/2 in the calculation. 
D)  Yes, break the problem up into 2 problems, one with the conditions for the first time interval and the other with the conditions for the second time interval, noting that for the second time interval the initial velocity is that from the end of the first time interval. When done, add the distances from each of the time intervals.

Question 11

A shot-putter moves his arm and the 7.0-kg shot through a distance of 1.0 m, giving the shot a velocity of 15 m/s from rest. Find the average force exerted on the shot during this time.

Accepted Answer

A)  197 N 
B)  394 N 
C)  600 N 
D)  790 N 
A)  197 N 
B)  394 N 
C)  600 N 
D)  790 N

Question 12

A baseball batter hits an incoming 40 m/s fastball. The ball leaves the bat at 60 m/s after a ball-on-bat contact time of 0.030 s. What is the force exerted on the 0.15 kg baseball?

Accepted Answer

A)  450 N 
B)  250 N 
C)  90 N 
D)  500 N 
A)  450 N 
B)  250 N 
C)  90 N 
D)  500 N

Question 13

The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. What total force would be required to accelerate a 30-kg object at 6.0 m/s2 on the Moon?

Accepted Answer

A)  30 N 
B)  10 N 
C)  180 N 
D)  49 N 
A)  30 N 
B)  10 N 
C)  180 N 
D)  49 N

Question 14

A rock is thrown straight down with an initial velocity of 17.5 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s2.)

Accepted Answer

A)  28 m 
B)  49 m 
C)  55 m 
D)  64 m 
A)  28 m 
B)  49 m 
C)  55 m 
D)  64 m

Question 15

It is late and Carlos is sliding down a rope from his third floor window to meet his friend Juan. As he slides down the rope faster and faster, he becomes frightened and grabs harder on the rope, increasing the tension in the rope. As soon as the upward tension in the rope becomes equal to his weight:

Accepted Answer

A)  Carlos will stop. 
B)  Carlos will slow down. 
C)  Carlos will continue down at a constant velocity. 
D)  the rope must break. 
A)  Carlos will stop. 
B)  Carlos will slow down. 
C)  Carlos will continue down at a constant velocity. 
D)  the rope must break.

Question 16

Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? The nearest value is:

Accepted Answer

A)  4.0 cm. 
B)  9.8 cm. 
C)  16 cm. 
D)  20 cm. 
A)  4.0 cm. 
B)  9.8 cm. 
C)  16 cm. 
D)  20 cm.

Question 17

John throws a rock down with speed 20 m/s from the top of a 30-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?

Accepted Answer

A)  12 m/s 
B)  28 m/s 
C)  31 m/s 
D)  78 m/s 
A)  12 m/s 
B)  28 m/s 
C)  31 m/s 
D)  78 m/s

Question 18

At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 20.0 m/s. How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff?

Accepted Answer

A)  5.05 s 
B)  3.76 s 
C)  2.48 s 
D)  1.78 s 
A)  5.05 s 
B)  3.76 s 
C)  2.48 s 
D)  1.78 s

Question 19

A rock, released at rest from the top of a tower, hits the ground after 2.0 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)

Accepted Answer

A)  15 m/s 
B)  20 m/s 
C)  31 m/s 
D)  39 m/s 
A)  15 m/s 
B)  20 m/s 
C)  31 m/s 
D)  39 m/s

Question 20

A cart of weight 60 N is accelerated across a level surface at 0.15 m/s2. What net force acts on the cart? (g = 9.8 m/s2)

Accepted Answer

A)  0.92 N 
B)  0.31 N 
C)  3.0 N 
D)  4.5 N 
A)  0.92 N 
B)  0.31 N 
C)  3.0 N 
D)  4.5 N

Exam 3: Forces and Motion in One Dimension

Find the tension in an elevator cable if the 1000-kg elevator is ascending with an acceleration of 1.2 m/s2, upward.

As a car skids with its wheels locked trying to stop on a road covered with ice and snow, the force of friction between the icy road and the tires will usually be:

A room has 110 ft2 of floor space. What is the approximate volume of the room? (You will need to make a reasonable estimate of a missing physical quantity.)

A cue ball of weight W is falling with an acceleration downward of g/3 and speed v. What is the magnitude of the drag force on the ball at this moment?

A stone is thrown downward from a cliff. Take "up" to be the positive direction. Which of the following statements is true about the stone?

A speeding car traveling at a constant velocity of 24 m/s passes a police care initially at rest beside the roadway. If the police car with constant acceleration of immediately pursues the speeding car, how far down the road does it draw even with the speeding car?

A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 4.0 m/s2. What is the magnitude of the cart's displacement during the first 6.0 s of its motion?

The coefficient of friction between a racecar's wheels and the track is 1.0. The car starts from rest and accelerates at a constant rate for 300 m. Find the maximum speed at the end of the race.

A ball rolls down an incline, starting from rest. If the total time it takes to reach the end of the incline is T, how much time has elapsed when it is halfway down the incline?

A shot-putter moves his arm and the 7.0-kg shot through a distance of 1.0 m, giving the shot a velocity of 15 m/s from rest. Find the average force exerted on the shot during this time.

A baseball batter hits an incoming 40 m/s fastball. The ball leaves the bat at 60 m/s after a ball-on-bat contact time of 0.030 s. What is the force exerted on the 0.15 kg baseball?

The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. What total force would be required to accelerate a 30-kg object at 6.0 m/s2 on the Moon?

A rock is thrown straight down with an initial velocity of 17.5 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s2.)

Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? The nearest value is:

John throws a rock down with speed 20 m/s from the top of a 30-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?

At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 20.0 m/s. How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff?

A rock, released at rest from the top of a tower, hits the ground after 2.0 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)

A cart of weight 60 N is accelerated across a level surface at 0.15 m/s2. What net force acts on the cart? (g = 9.8 m/s2)

Introduction

Motion, Forces, and Newtons Laws

Forces and Motion in Two and Three Dimensions

Circular Motion and Gravitation

Work and Energy

Momentum, Impulse, and Collisions

Rotational Motion

Energy and Momentum of Rotational Motion

Fluids

Harmonic Motion and Elasticity

Waves

Sound

Temperature and Heat

Gases and Kinetic Theory

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Currents and Circuits

Magnetic Fields and Forces

Magnetic Induction

Alternating-Current Circuits and Machines

Electromagnetic Waves

Geometrical Optics

Wave Optics

Applications of Optics

Relativity

Quantum Theory

Atomic Theory

Nuclear Physics

Physics in the 21st Century

Filters

Find the tension in an elevator cable if the 1000-kg elevator is ascending with an acceleration of 1.2 m/s², upward.

A room has 110 ft² of floor space. What is the approximate volume of the room? (You will need to make a reasonable estimate of a missing physical quantity.)

A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 4.0 m/s². What is the magnitude of the cart's displacement during the first 6.0 s of its motion?

The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. What total force would be required to accelerate a 30-kg object at 6.0 m/s² on the Moon?

A rock is thrown straight down with an initial velocity of 17.5 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s².)

John throws a rock down with speed 20 m/s from the top of a 30-m tower. If g = 9.8 m/s² and air resistance is negligible, what is the rock's speed just as it hits the ground?

A rock, released at rest from the top of a tower, hits the ground after 2.0 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s² and air resistance is negligible)

A cart of weight 60 N is accelerated across a level surface at 0.15 m/s². What net force acts on the cart? (g = 9.8 m/s²)