It requires 55N of force to ring the bell at a hammer swing carnival game. If Donald Duckcan generate 250W of power while swinging the hammer down in .85s, does he produce enough force to ring the bell at a height of 7m?

If Donald doubled his power to 500W, what happens to the force he generates?

Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep.

How much more work would you do taking the longer path? the same twice as much half as much four times as much

How much power would you exert taking the longer path, assuming your speed remained constant?

It takes a professional sprinter roughly 10s to run 100m. If the sprinter produces 50 W of power during the sprint

How much work did he do?

If the sprinter were to decrease his time to 9.5s, how much less work would he need to do?

Two strongmen, Thor and Hulk, are trying to figure who is more powerful. They are both going to lift 2500kg straight over their heads. Thor, not as tall as hulk, must lift the weight to a height of 2.5m. Hulk must lift the weight to a height of 4.7m.

What is the work done by Thor?

What is the work done by Hulk?

If Thor can lift the weight in 1.7s and Hulk lifts it in 2.8s, who is more powerful?

In order to hit a home run, you need to apply a force of 1700Nto the baseball. How much work is done on a 0.14kg baseball to hit it a distance of 110m?

How much power is delivered to the baseball if the hitter takes 0.35s to swing the bat?

You run out of gas in your 1600kg car. You and your friend are capable of producing 300Nand 250N of forcerespectively.

How much does the car weight? (Hint: weight and mass are not the same thing)

If you and your friend both push the car for 20m, how much work did you collectively perform?

After 20m, your friend stops pushing. You push the car another 10m, how much work did you perform in this 10m?

If it took 100s to push the car the first 20m, how much power did you and your friend generate?

An escalator is used to move 20 passengers every 60s from the first floor of a department store to the second. The second floor is located 5.2m above the first floor. The average passenger's mass is 54.9 kg. Determine the power requirement of the escalator in order to move this number of passengers in this amount of time.

Ben Travlun carries a 200N suitcase up three flights of stairs (a height of 10.0 m) and then pushes it with a horizontal force of 50N at a constant speed of 0.5 m/s for a horizontal distance of 35m. How much work does Ben do on his suitcase during thisentiremotion?

You and your friend, both of the same mass, jogup a flight of stairs.

What can you say about the work done by the two of you?

If you wanted to produce more power than your friend, what could you do?

Which of the following are true. Select all that apply.

• In order for work to be done an object must move
• If I push as hard as I can against a wall, I am doing work
• Lifting a grocery bag off the floor is considered work
• If I perform work quicker, I am more powerful
• If I push straight down on a chair and the chair moves left, I have done work on the chair
• Friction can do work on a moving object
• Holding a bowling ball straight out in front of you is doing work