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

An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 12.0 s.What distance does the car travel?

Accepted Answer

A)  150 m 
B)  180 m 
C)  360 m 
D)  750 m 
A)  150 m 
B)  180 m 
C)  360 m 
D)  750 m B

Question 3

Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another.The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2.What is the magnitude of the force exerted on the right cube by the middle cube in this case?

Accepted Answer

A)  12 N 
B)  18 N 
C)  24 N 
D)  none of the above 
A)  12 N 
B)  18 N 
C)  24 N 
D)  none of the above B

Question 4

If the displacement of an object is given in SI units by Δx = −5t + t 2,at t = 2 s its velocity and acceleration are,respectively: (Hint: Use dimensional analysis along with the equations for motion with constant acceleration. )

Accepted Answer

A)  positive,positive. 
B)  positive,negative. 
C)  negative,negative. 
D)  negative,positive. 
A)  positive,positive. 
B)  positive,negative. 
C)  negative,negative. 
D)  negative,positive.

Question 5

A karate master strikes a board with an initial velocity of 10.0 m/s,decreasing to 2.0 m/s as his hand passes through the board.If the time of contact with the board is 0.0020 s,and the mass of the coordinated hand and arm is 1.0 kg,what is the force exerted on the board?

Accepted Answer

A)  1000 N 
B)  6000 N 
C)  4000 N 
D)  4500 N 
A)  1000 N 
B)  6000 N 
C)  4000 N 
D)  4500 N

Question 6

Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another.The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2.What is the magnitude of the force exerted on the middle cube by the left cube in this case?

Accepted Answer

A)  18 N 
B)  27 N 
C)  54 N 
D)  none of the above 
A)  18 N 
B)  27 N 
C)  54 N 
D)  none of the above

Question 7

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 8

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 9

The acceleration due to gravity on the Moon's surface is one-sixth that on Earth.An astronaut's life support backpack weighs 240 lb on Earth.What does it weigh on the Moon?

Accepted Answer

A)  40 lb 
B)  120 lb 
C)  80 lb 
D)  240 lb 
A)  40 lb 
B)  120 lb 
C)  80 lb 
D)  240 lb

Question 10

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 11

Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless,level surface.Attached to the 8.0-kg mass is a second light string,which a person uses to pull both blocks horizontally.If the two-block system accelerates at 1.0 m/s2,what is the tension in the second string attached to the 8.0-kg mass?

Accepted Answer

A)  14 N 
B)  6.0 N 
C)  28 N 
D)  4.0 N 
A)  14 N 
B)  6.0 N 
C)  28 N 
D)  4.0 N

Question 12

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 13

A cheetah can run at approximately 100 km/hr and a gazelle at 80.0 km/hr.If both animals are running at full speed,with the gazelle 60.0 m ahead,how long before the cheetah catches its prey?

Accepted Answer

A)  6.30 s 
B)  21.6 s 
C)  5.40 s 
D)  10.8 s 
A)  6.30 s 
B)  21.6 s 
C)  5.40 s 
D)  10.8 s

Question 14

If the drag force on a car is F at a moderate highway speed v,at what speed would the drag force be doubled?

Accepted Answer

A)  1.2v 
B)  1.4v 
C)  1.7v 
D)  2.0v 
A)  1.2v 
B)  1.4v 
C)  1.7v 
D)  2.0v

Question 15

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 16

When a drag strip vehicle reaches a velocity of 60 m/s,it begins a negative acceleration by releasing a drag chute and applying its brakes.While reducing its velocity back to zero,its acceleration along a straight line path is a constant −6.0 m/s2.What displacement does it undergo during this deceleration period?

Accepted Answer

A)  120 m 
B)  300 m 
C)  320 m 
D)  240 m 
A)  120 m 
B)  300 m 
C)  320 m 
D)  240 m

Question 17

A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/s in 6.00 seconds.She then pulls the parachute cord and after a 4.00-second constant deceleration,descends at 10.0 m/s for 80.0 seconds,reaching the ground.From what height did the parachutist jump?

Accepted Answer

A)  914 m 
B)  1110 m 
C)  1520 m 
D)  1750 m 
A)  914 m 
B)  1110 m 
C)  1520 m 
D)  1750 m

Question 18

There are six books in a stack,each with a weight of 3.0 N.The coefficient of friction between all the books is 0.20 as is the coefficient between the table and the bottom book.What horizontal push must I just exceed on the next to bottom book to start sliding the top five books off the bottom one?

Accepted Answer

A)  1.0 N 
B)  5.0 N 
C)  3.0 N 
D)  7.0 N 
A)  1.0 N 
B)  5.0 N 
C)  3.0 N 
D)  7.0 N

Question 19

Norma releases a bowling ball from rest;it rolls down a ramp with constant acceleration.After half a second it has traveled 0.40 m.How far has it traveled after two seconds?

Accepted Answer

A)  3.2 m 
B)  6.4 m 
C)  9.0 m 
D)  16 m 
A)  3.2 m 
B)  6.4 m 
C)  9.0 m 
D)  16 m

Question 20

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.

Exam 3: Vectors and Two-Dimensional Motion: Part A

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

An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 12.0 s.What distance does the car travel?

If the displacement of an object is given in SI units by Δx = −5t + t 2,at t = 2 s its velocity and acceleration are,respectively: (Hint: Use dimensional analysis along with the equations for motion with constant acceleration. )

A karate master strikes a board with an initial velocity of 10.0 m/s,decreasing to 2.0 m/s as his hand passes through the board.If the time of contact with the board is 0.0020 s,and the mass of the coordinated hand and arm is 1.0 kg,what is the force exerted on the board?

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 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.

The acceleration due to gravity on the Moon's surface is one-sixth that on Earth.An astronaut's life support backpack weighs 240 lb on Earth.What does it weigh on the Moon?

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?

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 cheetah can run at approximately 100 km/hr and a gazelle at 80.0 km/hr.If both animals are running at full speed,with the gazelle 60.0 m ahead,how long before the cheetah catches its prey?

If the drag force on a car is F at a moderate highway speed v,at what speed would the drag force be doubled?

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 parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/s in 6.00 seconds.She then pulls the parachute cord and after a 4.00-second constant deceleration,descends at 10.0 m/s for 80.0 seconds,reaching the ground.From what height did the parachutist jump?

There are six books in a stack,each with a weight of 3.0 N.The coefficient of friction between all the books is 0.20 as is the coefficient between the table and the bottom book.What horizontal push must I just exceed on the next to bottom book to start sliding the top five books off the bottom one?

Norma releases a bowling ball from rest;it rolls down a ramp with constant acceleration.After half a second it has traveled 0.40 m.How far has it traveled after two seconds?

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?

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

Filters

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

If the displacement of an object is given in SI units by Δx = −5t + t ²,at t = 2 s its velocity and acceleration are,respectively: (Hint: Use dimensional analysis along with the equations for motion with constant acceleration. )

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?

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?