1. Work, Power, and Energy Review

2. You walk down the hall 20m carrying your bookbag
You walk down the hall 20m carrying your bookbag. You then walk up the stairs which are 10m tall. Then you walk another 25m to the gym. This took you 2minutes. What is the work done against gravity? The weight of you and the bookbag is 500N.

3. If I had to run up those stairs (which are 10m tall), and I did that in 5 seconds, what is my power if I weigh 800 Newtons?

4. If a Great Blue Heron does 1000N-m of work by lifting up a fish 0
If a Great Blue Heron does 1000N-m of work by lifting up a fish 0.5m out of the water. What is the weight of the fish?

5. You are in an elevator. You ascend 20m in 10seconds
You are in an elevator. You ascend 20m in 10seconds. The power of the elevator, then is 8000watts. What is the total weight of the elevator and everyone in it?

6. If 30J of work was done to this 2kg bike, how fast can I get the bike to go?

7. What is the GPE of a book that has a mass of 3kg that is sitting on a shelf that is 4 m above the ground?

8. I needed to use a jack in order to lift a 2000N box a distance of 3m
I needed to use a jack in order to lift a 2000N box a distance of 3m. To do this, I had to push on the lever with 80N of force and push down on a total distance of 30m.
Work output? Work input?
Mechanical Advantage? Efficiency?