A 1000kg car accelerates from rest to 60mph (134m/s) in 10s. During this time, i

Question

A 1000kg car accelerates from rest to 60mph (134m/s) in 10s.

During this time, its engine was operating at 3600rpm.

(a) Use the work-energy theorem to find the net work done by the

car (Hint: there is no change in potential energy).

(b) Determine the number of cycles the engine goes through in

10s.

(c) How much work is done per cycle?

(d) Efficiency of an engine is given by ÃŽ µ =Wnet/QH.

Now assuming that this engine has an efficiency of

ÃŽ µ=20%, find the average heat flow into the engine in

each cycle.

Explanation / Answer

8978000 J

600 cycles

14963.3 J

74816.7 J

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