Question 1

In raising an object to a given height by means of an inclined plane, as compared with raising the object vertically, there is a reduction in:

Accepted Answer

A) work required 
B) distance pushed 
C) friction 
D) force required 
E) value of the acceleration due to gravity 
A) work required 
B) distance pushed 
C) friction 
D) force required 
E) value of the acceleration due to gravity

Question 2

The plot shows the force on an object as it moves from x = 0 m to x = 20 m.How much work is done on the object?

Accepted Answer

A) 40 J 
B) 90 J 
C) 200 J 
D) 450 J 
E) 750 J 
A) 40 J 
B) 90 J 
C) 200 J 
D) 450 J 
E) 750 J

Question 3

A 50-N force is the only force on a 2-kg crate that starts from rest.At the instant the crate has gone 2 m the rate at which the force is doing work is:

Accepted Answer

A) 2.5 W 
B) 25 W 
C) 75 W 
D) 100 W 
E) 500 W 
A) 2.5 W 
B) 25 W 
C) 75 W 
D) 100 W 
E) 500 W

Question 4

A 1-kg block is lifted vertically 1 m at constant speed by a boy.The work done by the boy is about:

Accepted Answer

A) 1 ft*lb 
B) 1 J 
C) 10 J 
D) 0.1 J 
E) 0 J 
A) 1 ft*lb 
B) 1 J 
C) 10 J 
D) 0.1 J 
E) 0 J

Question 5

A 0.50-kg object moves on a horizontal frictionless circular track with a radius of 2.5 m.An external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes around.If it starts from rest, then at the end of one revolution the radial component of the force of the track on it is:

Accepted Answer

A) 19 N 
B) 38 N 
C) 47 N 
D) 75 N 
E) 96 N 
A) 19 N 
B) 38 N 
C) 47 N 
D) 75 N 
E) 96 N

Question 6

An ideal spring is hung vertically from the ceiling.When a 2.0-kg mass hangs at rest from it, the spring is extended 6.0 cm from its relaxed length.A downward external force is now applied to the mass to extend the spring an additional 10 cm.While the spring is being extended by the force, the work done by the spring is:

Accepted Answer

A) -3.6 J 
B) -3.3 J 
C) -1.0 J 
D) 3.3 J 
E) 3.6 J 
A) -3.6 J 
B) -3.3 J 
C) -1.0 J 
D) 3.3 J 
E) 3.6 J

Question 7

Two trailers, X with mass 500 kg and Y with mass 2000 kg, are being pulled at the same speed.The ratio of the kinetic energy of Y to that of X is:

Accepted Answer

A) 1:1 
B) 2:1 
C) 4:1 
D) 9:1 
E) 1500:1 
A) 1:1 
B) 2:1 
C) 4:1 
D) 9:1 
E) 1500:1

Question 8

A watt per hour is a unit of:

Accepted Answer

A) energy 
B) power 
C) force 
D) acceleration 
E) none of these 
A) energy 
B) power 
C) force 
D) acceleration 
E) none of these

Question 9

Camping equipment weighing 6000 N is pulled across a frozen lake by means of a horizontal rope.The coefficient of kinetic friction is 0.05.The work done by the campers in pulling the equipment 1000 m at constant velocity is:

Accepted Answer

A) 0 J 
B) 1.5* 105 J 
C) 3.0 * 105 J 
D) 2.9*106 J 
E) 6.0 * 106 J 
A) 0 J 
B) 1.5* 105 J 
C) 3.0 * 105 J 
D) 2.9*106 J 
E) 6.0 * 106 J

Question 10

At time t = 0 a particle starts moving along the x axis.If its kinetic energy increases uniformly with t the net force acting on it must be:

Accepted Answer

A) constant 
B) proportional to t 
C) inversely proportional to t 
D) proportional to   
E) proportional to 1/   
A) constant 
B) proportional to t 
C) inversely proportional to t 
D) proportional to   
E) proportional to 1/

Question 11

An object of mass 1 kg is whirled in a horizontal circle of radius 0.5 m at a constant speed of 2 m/s.The work done on the object during one revolution is:

Accepted Answer

A) 0 J 
B) 1 J 
C) 2 J 
D) 4 J 
E) 16 J 
A) 0 J 
B) 1 J 
C) 2 J 
D) 4 J 
E) 16 J

Question 12

A kilowatt hour is a unit of:

Accepted Answer

A) power 
B) energy/time 
C) energy 
D) power/time 
E) force/distance 
A) power 
B) energy/time 
C) energy 
D) power/time 
E) force/distance

Question 13

A watt .second is a unit of:

Accepted Answer

A) force 
B) power 
C) displacement 
D) speed 
E) energy 
A) force 
B) power 
C) displacement 
D) speed 
E) energy

Exam 7: Kinetic Energy and Work

In raising an object to a given height by means of an inclined plane, as compared with raising the object vertically, there is a reduction in:

The plot shows the force on an object as it moves from x = 0 m to x = 20 m.How much work is done on the object?

A 50-N force is the only force on a 2-kg crate that starts from rest.At the instant the crate has gone 2 m the rate at which the force is doing work is:

A 1-kg block is lifted vertically 1 m at constant speed by a boy.The work done by the boy is about:

Two trailers, X with mass 500 kg and Y with mass 2000 kg, are being pulled at the same speed.The ratio of the kinetic energy of Y to that of X is:

A watt per hour is a unit of:

Camping equipment weighing 6000 N is pulled across a frozen lake by means of a horizontal rope.The coefficient of kinetic friction is 0.05.The work done by the campers in pulling the equipment 1000 m at constant velocity is:

At time t = 0 a particle starts moving along the x axis.If its kinetic energy increases uniformly with t the net force acting on it must be:

An object of mass 1 kg is whirled in a horizontal circle of radius 0.5 m at a constant speed of 2 m/s.The work done on the object during one revolution is:

A kilowatt hour is a unit of:

A watt .second is a unit of:

Measurement

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Force and Motion

Force and Motion

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

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Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Coulombs Law

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Gauss Law

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Magnetic Fields Due to Currents

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Maxwells Equations; Magnetism of Matter

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Conduction of Electricity in Solids

Energy From the Nucleus

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