Conceptual Physics Energy

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

• 400 J

• 1000 J

• 1600 J

• 4000 J

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

• 400 J

• 1000 J

• 1600 J

• 4000 J

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

• 400 W

• 1000 W

• 1600 W

• 4000 W

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

• 400 W

• 1000 W

• 1600 W

• 4000 W

When work is done twice as quickly, then the power expended is

• half.

• the same.

• twice.

• 4 times as much.

When work is done twice as quickly, then the power expended is

• half

• the same

• twice

• 4 times as much

If a charging elephant has kinetic energy, it must also have

• potential energy.

• momentum.

• work.

• All of these.

If a charging elephant has kinetic energy, it must also have

• potential energy.

• momentum.

• work.

• All of these.

A model airplane moves twice as fast as another identical model airplane. Compared with the kinetic energy of the slower airplane, the kinetic energy of the faster airplane is

• the same for level flight.

• twice as much.

• 4 times as much.

• more than 4 times as much.

A model airplane moves twice as fast as another identical model airplane. Compared with the kinetic energy of the slower airplane, the kinetic energy of the faster airplane is

• the same for level flight.

• twice as much.

• 4 times as much.

• more than 4 times as much.