physic (power,energy,work)
2011-03-01 4:58 am
A car of mass 500 kg is moving at 40ms^-1 . When the brakes are applied. the car slows down to 10ms^-1. The energy converted into heat is .....
回答 (1)
2011-03-01 5:26 am
✔ 最佳答案
Work done by friction = change of kinetic energyhence, work done by friction = (1/2) x 500 x (40^2 - 10^2) J = 375 000 J
The energy so dissipated appears as heat, hence the heat energy produced = 375 000 J
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110228000051KK01286