Chapter 13 Work and Energy Test

1.

1 point

Electrical energy results from the location of charged particles in a(n) _________________.

ionic storage unit

electric containment

lightning bolt

electric field

2.

1 point

A beaker of water over a burner is an example of which kind of system?

Isolated System

Open System

Closed System

Crowded System

3.

1 point

A wheel and axle is

an inclined plane wrapped around a cylinder.

formed of two inclined planes placed back to back.

just like a pulley.

made up of a lever or a pulley connected to a shaft.

4.

1 point

Whenever work is done, energy is transformed or is transferred from one system to another system.

True

False

5.

1 point

The ________________ of a machine is a measure of how much useful work a machine can do.

6.

1 point

______________: the transfer of energy to an object by the application of a force that causes the object to move in the direction of the force.

8.

1 point

Calculate the mechanical advantage of a ramp that is 5.0 m long and 1.5 m high. Round to the nearest tenth if necessary.

9.

1 point

Which of the following is an example of a screw?

Bicycle

Ax Blade

Jar Lid

Hammer

10.

1 point

Machines help do work by changing the size of an input force, the direction of the force, or both.

True

False

11.

1 point

Kinetic energy depends on mass more than it depends on speed.

True

False

12.

1 point

All levers have a rigid arm that pivots around a point called the _____________.

13.

1 point

In a _________-class lever, the fulcrum is at one end of the arm, and the input force is applied to the other end.

second

third

first

fourth

14.

1 point

What do nuclear fusion and nuclear fission have in common?

The fact that both processes contain the word "nuclear" is indicative of the fact that they behave exactly the same.

They have nothing in common since they are polar opposites.

Small quantities of mass are converted into large quantities of energy.

Both processes come from the energy of the sun.

15.

1 point

What is the kinetic energy of a 44 kg cheetah running at 31 m/s?

2.1 x 10^4 J

2.8 x 10^9 J

1.7 x 10^2 J

2.5 x 10^5 J

16.

1 point

Multiple pulleys are sometimes combined into a single unit called a ________________.

17.

1 point

Read the following sentence.

"For any system, the net change in energy equals the energy transferred as work and as heat. When no energy is transferred as heat or as work, mechanical energy is conserved."

Which choice below specifically describes the sentence above?

First Law of Thermodynamics

Law of Conservation of Energy

Energy Transformation

Second Law of Thermodynamics

18.

1 point

A sailor uses a rope and an old, squeaky pulley to raise a sail that weighs 140 N. He finds that he must do 180 J of work on the rope to raise the sail by 1 m. (He does 140 J of work on the sail.) What is the efficiency of the pulley? Express your answer as a percentage. Once in percent, round to the nearest whole number if necessary.

19.

1 point

A 65 kg rock climber ascends a cliff. What is the climber's gravitational potential energy at a point 35 m above the base of the cliff?

2.2 x 10^4 J

8.8 x 10^3 J

4.3 x 10^2 J

1.9 x 10^6 J

20.

1 point

Energy that lies at the level of the atom is sometimes called ____________________________.

radiant energy

nuclear energy

nonmechanical energy

potential energy