Question 1

A total of 4900 J is expended in lifting a 50-kg mass. The mass is raised to a height of

Accepted Answer

A)  10 m. 
B)  98 m. 
C)  960 m. 
D)  245,000 m. 
A)  10 m. 
B)  98 m. 
C)  960 m. 
D)  245,000 m. A

Question 2

A rocket is fired in space. As it moves, the total momentum of the rocket and its exhaust gases

Accepted Answer

A)  decreases. 
B)  remains the same. 
C)  increases. 
D)  Any of the choices could be correct, depending on the nature of the rocket. 
A)  decreases. 
B)  remains the same. 
C)  increases. 
D)  Any of the choices could be correct, depending on the nature of the rocket. B

Question 3

A ball whose momentum is mv strikes a wall and bounces off. The change in the ball's momentum is

Accepted Answer

A)  0. 
B)  0.5 mv 
C)  mv 
D)  2 mv 
A)  0. 
B)  0.5 mv 
C)  mv 
D)  2 mv D

Question 4

When a ton of coal burns, it loses 3.3 × 10-7 kg of mass. The energy given off is

Accepted Answer

A)  3.7 × 10-24 J. 
B)  3.3 × 10-7 J. 
C)  100 J. 
D)  3.0 × 1010 J. 
A)  3.7 × 10-24 J. 
B)  3.3 × 10-7 J. 
C)  100 J. 
D)  3.0 × 1010 J.

Question 5

A horizontal force is applied to a 2-kg ball on a smooth table. The ball's speed is 8 m/s when it has gone 4 m. The magnitude of the force is

Accepted Answer

A)  1.6 N. 
B)  2 N. 
C)  8 N. 
D)  16 N. 
A)  1.6 N. 
B)  2 N. 
C)  8 N. 
D)  16 N.

Question 6

A weightlifter raises a 200-kg barbell through a height of 2 m in 2.2 s. The average power he develops during the lift is

Accepted Answer

A)  0.18 kW. 
B)  0.89 kW. 
C)  1.78 kW. 
D)  8.62 kW. 
A)  0.18 kW. 
B)  0.89 kW. 
C)  1.78 kW. 
D)  8.62 kW.

Question 7

A 1-kg object is moving at 10 m/s. To double its kinetic energy, its speed should be increased to approximately

Accepted Answer

A)  14 m/s. 
B)  15 m/s. 
C)  20 m/s. 
D)  40 m/s. 
A)  14 m/s. 
B)  15 m/s. 
C)  20 m/s. 
D)  40 m/s.

Question 8

A 2-kg book is held 1 m above the floor for 50 s. The work done is

Accepted Answer

A)  0. 
B)  10.2 J. 
C)  100 J. 
D)  980 J. 
A)  0. 
B)  10.2 J. 
C)  100 J. 
D)  980 J.

Question 9

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s. Her recoil speed is

Accepted Answer

A)  0.2 mm/s. 
B)  2 mm/s. 
C)  2 cm/s. 
D)  20 cm/s. 
A)  0.2 mm/s. 
B)  2 mm/s. 
C)  2 cm/s. 
D)  20 cm/s.

Question 10

The KE of a 900-kg car whose speed is 60 km/h is

Accepted Answer

A)  12.8 kJ. 
B)  125 kJ. 
C)  1.23 MJ. 
D)  1.62 MJ. 
A)  12.8 kJ. 
B)  125 kJ. 
C)  1.23 MJ. 
D)  1.62 MJ.

Question 11

The mass equivalent of 6.0 MJ is

Accepted Answer

A)  6.7 × 10-11 kg. 
B)  5.4 × 10-9 kg. 
C)  6.7 × 10-3 kg. 
D)  2.0 × 10-2 kg. 
A)  6.7 × 10-11 kg. 
B)  5.4 × 10-9 kg. 
C)  6.7 × 10-3 kg. 
D)  2.0 × 10-2 kg.

Question 12

The mechanical advantage of a pair of scissors might be

Accepted Answer

A)  0. 
B)  1/2. 
C)  2. 
D)  -2. 
A)  0. 
B)  1/2. 
C)  2. 
D)  -2.

Question 13

The work you do in raising an orange from your waist to your mouth is roughly

Accepted Answer

A)  1 J. 
B)  10 J. 
C)  100 J. 
D)  1,000 J. 
A)  1 J. 
B)  10 J. 
C)  100 J. 
D)  1,000 J.

Question 14

Which one or more of the following is a vector quantity?

Accepted Answer

A)  linear momentum 
B)  angular momentum 
C)  kinetic energy 
D)  potential energy 
E)  Both A and B 
A)  linear momentum 
B)  angular momentum 
C)  kinetic energy 
D)  potential energy 
E)  Both A and B

Question 15

A 40-kg boy climbs a vertical ladder at 0.5 m/s. His power output is

Accepted Answer

A)  5 W. 
B)  14 W. 
C)  20 W. 
D)  196 W. 
A)  5 W. 
B)  14 W. 
C)  20 W. 
D)  196 W.

Question 16

If a shell fired from a cannon explodes in midair,

Accepted Answer

A)  its total momentum increases. 
B)  its total momentum decreases. 
C)  its total KE increases. 
D)  its total KE decreases. 
A)  its total momentum increases. 
B)  its total momentum decreases. 
C)  its total KE increases. 
D)  its total KE decreases.

Question 17

7. A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same

Accepted Answer

A)  speed. 
B)  potential energy. 
C)  kinetic energy. 
D)  rest energy. 
A)  speed. 
B)  potential energy. 
C)  kinetic energy. 
D)  rest energy.

Question 18

A 150-kg safe on frictionless casters is being raised 1.20 m to the bed of a truck using planks 4.00 m long. The force needed to push the safe up is

Accepted Answer

A)  441 N. 
B)  450 N. 
C)  500 N. 
D)  1470 N. 
A)  441 N. 
B)  450 N. 
C)  500 N. 
D)  1470 N.

Question 19

A horse has a power output of 1 hp 746 W) when it is pulling a cart. If the cart covers 100 m in 30 s, the force the horse exerts on the cart is

Accepted Answer

A)  0.22 kN. 
B)  0.34 kN. 
C)  0.45 kN. 
D)  2.49 kN. 
A)  0.22 kN. 
B)  0.34 kN. 
C)  0.45 kN. 
D)  2.49 kN.

Question 20

A moving object does not necessarily have

Accepted Answer

A)  velocity. 
B)  momentum. 
C)  kinetic energy. 
D)  potential energy. 
A)  velocity. 
B)  momentum. 
C)  kinetic energy. 
D)  potential energy.

A total of 4900 J is expended in lifting a 50-kg mass. The mass is raised to a height of

A rocket is fired in space. As it moves, the total momentum of the rocket and its exhaust gases

A ball whose momentum is mv strikes a wall and bounces off. The change in the ball's momentum is

When a ton of coal burns, it loses 3.3 × 10^-7 kg of mass. The energy given off is

A horizontal force is applied to a 2-kg ball on a smooth table. The ball's speed is 8 m/s when it has gone 4 m. The magnitude of the force is

A weightlifter raises a 200-kg barbell through a height of 2 m in 2.2 s. The average power he develops during the lift is

A 1-kg object is moving at 10 m/s. To double its kinetic energy, its speed should be increased to approximately

A 2-kg book is held 1 m above the floor for 50 s. The work done is

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s. Her recoil speed is

The KE of a 900-kg car whose speed is 60 km/h is

The mass equivalent of 6.0 MJ is

The mechanical advantage of a pair of scissors might be

The work you do in raising an orange from your waist to your mouth is roughly

Which one or more of the following is a vector quantity?

A 40-kg boy climbs a vertical ladder at 0.5 m/s. His power output is

If a shell fired from a cannon explodes in midair,

_7.A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same

A 150-kg safe on frictionless casters is being raised 1.20 m to the bed of a truck using planks 4.00 m long. The force needed to push the safe up is

A horse has a power output of 1 hp 746 W) when it is pulling a cart. If the cart covers 100 m in 30 s, the force the horse exerts on the cart is

A moving object does not necessarily have

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Exam 3: Energy

A total of 4900 J is expended in lifting a 50-kg mass. The mass is raised to a height of

A rocket is fired in space. As it moves, the total momentum of the rocket and its exhaust gases

A ball whose momentum is mv strikes a wall and bounces off. The change in the ball's momentum is

When a ton of coal burns, it loses 3.3 × 10-7 kg of mass. The energy given off is

A horizontal force is applied to a 2-kg ball on a smooth table. The ball's speed is 8 m/s when it has gone 4 m. The magnitude of the force is

A weightlifter raises a 200-kg barbell through a height of 2 m in 2.2 s. The average power he develops during the lift is

A 1-kg object is moving at 10 m/s. To double its kinetic energy, its speed should be increased to approximately

A 2-kg book is held 1 m above the floor for 50 s. The work done is

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s. Her recoil speed is

The KE of a 900-kg car whose speed is 60 km/h is

The mass equivalent of 6.0 MJ is

The mechanical advantage of a pair of scissors might be

The work you do in raising an orange from your waist to your mouth is roughly

Which one or more of the following is a vector quantity?

A 40-kg boy climbs a vertical ladder at 0.5 m/s. His power output is

If a shell fired from a cannon explodes in midair,

7. A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same

A 150-kg safe on frictionless casters is being raised 1.20 m to the bed of a truck using planks 4.00 m long. The force needed to push the safe up is

A horse has a power output of 1 hp 746 W) when it is pulling a cart. If the cart covers 100 m in 30 s, the force the horse exerts on the cart is

A moving object does not necessarily have

The Scientific Method

Motion

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe Galaxies

Filters

When a ton of coal burns, it loses 3.3 × 10^-7 kg of mass. The energy given off is

_7.A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same