2. A car, starting from rest, rolls down a 200m high hill, how fast is it going at the bottom of the hill, if the energy transfer has a 70% efficiency?
4. A 1,000,000kg space ship is floating in space, then the nuclear engine converts 3 grams of matter into energy at =85%, how much did it speed up? (ignore relativity)
6. A bow with a spring constant of 300 N/m Shoots a .01 kg arrow, how fast does it leave the bow if the draw length is .6 m and the =.9.
8. A 1500 kg hybrid car moving at 60 m/s comes to a stop, how many KWhr are stored in the battery if = .82?
10. 5 kg of coal is used to heat 800 kg of water, how much does the temperature go up? = .34
12. 1000 kg of natural gas is converted to electricity at 55% efficiency, How many KWhr are produced?
14. A solar panel with an Area of 3.5m² has an efficiency of 18%, how many KWhr are produced in a 12 hour sunny day? Solar intensity is 840 W/m².
16. 1 kg of mass is converted to electricity, how many KWhr are produced? =.25
18. 13 KWhr of electricity is used to heat 20,000 kg of water with 55% efficiency. How much does the temperature go up?