Work and Power

Question 1

Which term is the rate at which work is done?

Revolt · Accepted Answer

power

Question 2

If 600 J of work is done in 3 s, what is the power? (Power: P = W/t)

Revolt · Accepted Answer

200 W

Question 3

Awanita is placing items on a shelf that is 200 cm above the ground. She exerts a force of 20 N to lift a box from the floor to the shelf. She does this in 5 s.What is Awanita’s power output? (Power: P = W/t)

Revolt · Accepted Answer

8 W

Question 4

Den pushes a desk 400 cm across the floor. He exerts a force of 10 N for 8 s to move the desk.What is his power output? (Power: P = W/t)

Revolt · Accepted Answer

5 W

Question 5

Pablo prepares to lift a barbell. During which stage of the lift does Pablo do work on the barbell?

Revolt · Accepted Answer

when he lifts the barbell from the floor to his chest

Question 6

Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work: W = Fd)

Revolt · Accepted Answer

2 m

Question 7

Joshua programs a robotic arm to place a block in a box by following the sequence of commands in the table.During which step does the robotic arm do work on the block?

Revolt · Accepted Answer

Step 2

Question 8

Tina and her puppy are tugging on a rope, each pulling on opposite ends.When is Tina doing work?

Revolt · Accepted Answer

whenever she pulls the puppy toward her

Question 9

Force and distance are used to calculate work. Work is measured in which unit?

Revolt · Accepted Answer

joules

Question 10

A gust of wind blowing east pushes against a ball. When will the wind do work on the ball?

Revolt · Accepted Answer

when the ball moves to the east

Work and Power Answers

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