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標題:

physic (power,energy,work)

 

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發問:

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 .....

最佳解答:

Work done by friction = change of kinetic energy hence, 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

其他解答:F5B24A77BB847046
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