Physics, 20.11.2019 06:31 FlayMaster101
(a) how high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h? (b) if, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting point, how much thermal energy was generated by friction? (c) what is the average force of friction if the hill has a slope 2.5º above the horizontal?
Answers: 3
J
= 110 km/h = 110 x 1000/3600 = 30.6 m/s
= 22 m
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