# Work and Power

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question
Tina and her puppy are tugging on a rope, each pulling on opposite ends. When is Tina doing work?
Whenever she pulls the puppy toward her.
question
When work is measured in joules and time is measures in seconds, power is measured in __________
"watts"
question
If 600 J of work is done in 3 s, what is the power? (Power: P = W/t)
200 W
question
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 10 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?
She did no work while she posed because she did not move the torch or the book.
question
A lawnmower engine running for 20 mins does 4,560,000 J of work. What is the power output of the engine? (Power: P = W/t)
NOT 228,000 W
question
What is needed for work to be done?
A force must cause an object to move along the same direction as the force.
question
Pablo prepares to lift a barbell. During which stage of the lift does Pablo do work on the barbell?
When he lifts the barbell from the floor to his chest.
question
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)
2 m
question
The rate at which work is done is called ________
NOT "Joule"
question
Joshua programs a robotic arm to place a block in a box by following a sequence of commands in the table. During which step does the robotic arm do work on the block?
Step 2
question
Henry can lift a 200 N load 20 m up a ladder in 40 s. Ricardo cab lift twice the load up one-half the distance in the same amount of time. Which comparison between Ricardo and Henry is correct?