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A 30 kg child and sled slides down a 9.0 meter high hill. It is going a speed 12 m/s at the bottom of the hill. How much mechanical energy was transformed into thermal energy?
A 360 J
B 490 J
C 2160 J
D 2646 J
 one year ago
 one year ago
A 30 kg child and sled slides down a 9.0 meter high hill. It is going a speed 12 m/s at the bottom of the hill. How much mechanical energy was transformed into thermal energy? A 360 J B 490 J C 2160 J D 2646 J
 one year ago
 one year ago

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cesckayBest ResponseYou've already chosen the best response.1
as the sleigh goes down, gravitational potential energy is converted to kinetic energy. hence if you find potential energy  kinetic energy, ur answer should be right about 490
 one year ago

natasha.ariesBest ResponseYou've already chosen the best response.0
how do u know u subtract?
 one year ago

cesckayBest ResponseYou've already chosen the best response.1
Energy transferred( P.E) = work done ( K. E.) + heat energy.. potential energy is converted (transferred) to kinetic energy as the sleigh glides down the slope.. there must be some kind of friction opposing the motion but it is negligible i suppose. As it slides down, kinetic energy is increasing because its gaining velocity. hence the lossed energy is converted to heat since energy cannot be created or destroyed. Law of conservation of energy
 one year ago

natasha.ariesBest ResponseYou've already chosen the best response.0
ohhh okay i think i get it lol
 one year ago
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