Work and Power Answers

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

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)

During a workout, a football player pushes a blocking dummy a distance of 30 m. While pushing the dummy the same distance a second time, what would the player need to change to be certain that power output increases?

Which term is the rate at which work is done?

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?

A lawnmower engine running for 20 min does 4,560,000 J of work. What is the power output of the engine? (Power: P = W/t)

Shani poses as the Statue of Liberty for an art class. She holds a torch above her head with her right hand and a book against her side with her left hand. She holds the pose for ten minutes. At the end of the session, she mentions to her friend that it was a lot of work to pose and that her arms are really tired.Which describes the work Shani did while she posed?(assume the starting work position is when her hand is already raised )

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)

Henry can lift a 200 N load 20 m up a ladder in 40 s. Ricardo can lift twice the load up one-half the distance in the same amount of time.Which comparison between Ricardo and Henry is correct?

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