1) What is the kinetic energy of a 10kg snowball traveling at 5m/s?
2) What is the gravitational potential energy of the snowball when it is stuck to the side of the school at 2m high?
3) What would be the mechanical energy of the snowball when it is stuck to the wall?
4) What is the ME of the snowball if it was dropped from the roof of the school at 12m/s when it was 5m off the ground?
5) What is the mass of a snowball that is traveling 20m/s when it reaches a height of 3m off the ground if it has a ME of 1200J?
6) What would be the work done ont eh 10kg snowball when you picked it up 2m off the ground?
7) If you picked up the 25kg head of a snowman and placed it on a 3m tall body in 1.2s, what would be you power?
8) The thermal energy of the work you did to roll a 42kg snowman body 18m with a force of 4N was 120J, how much heat did you produce while rolling the body?
9) If you used a total of 1900J of KE to build the snowman, how much chemical energy would you need to consume to replace your total energy?
10) If it takes 10J of thermal energy to melt 1kg of snow, what temperature (C) would it have to be for the snow to begin melting?
11) If you Wii requires 120v of voltage and 15A of current, how much resistance does it provide?
12) What is the power of a Wii under the previous circumstances?
13) How long (hrs) did you play your Wii if you used 3,000,000J of energy with 10W of power?
14) Some microwave ovens have an output of 2,000W. With 120v, what size breaker should be used (10, 15, 20, or 30 amps)?
15) If the microwave cooks popcorn in 180s, what is the energy it uses?
16) What would be the resistance of the microwave at 17 amps?
17) What would be your monthly bill of you cooked only popcorn 15 times in a month at $0.19/kWhr?
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Answers & Comments
Verified answer
KE = 1/2 * mass * velocity^2
PE = 1/2 * mass * g * height where g is accel. of gravity
V=IR
I ran out of energy for the rest.