Work and Power

Question 1

Which statements describe a situation in which work is being done? Check all that apply.

Revolt · Accepted Answer

A box is carried up a flight of stairs by a mover.; Wind blows a pool chair across the yard.; A weightlifter lifts a barbell off the ground.

Question 2

✔ ABC

Revolt · Accepted Answer

A

Question 3

If 120 N of force is applied to a crate to move it 15 m, how much work is done?

Revolt · Accepted Answer

1,800 J

Question 4

AB✔ C

Revolt · Accepted Answer

C

Question 5

Carlos uses a rope to pull his car 30 m to a parking lot because it ran out of gas. If Carlos exerts 2,000 N of force to pull the rope, and the rope is at an angle of 15° to the road, how much work did he do? Round your answer to two significant figures.

Revolt · Accepted Answer

5.8 × 104 J

Question 6

An air pump does 5,600 J of work to launch a water bottle rocket into the air. If the air pump applies 150 N of force to the rocket at an angle of 45° to the ground, what is the horizontal distance the water bottle rocket travels? Round your answer to two significant figures.

Revolt · Accepted Answer

5.3 × 101 m

Question 7

✔ ABC

Revolt · Accepted Answer

✔ A

Work and Power Answers

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