Work and Power Answers

Four students were loading boxes of food collected during a food drive. The force that each student exerted while lifting and the distance each box was lifted are listed in the table.Which lists the students in order from the greatest amount of work done to the least? (Work: W = Fd)

Power is measured in which unit?

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

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 )

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?

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)

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)

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?

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

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