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).

Wnet= 89780000J

(b) Determine the number of cycles the engine goes through in 10s.

Ncycles= ? cycles

(c) How much work is done per cycle?

Wnet/cycle= ? J/cycle

(d) Efficiency of an engine is given by ε =Wnet/QH. Now assuming that this engine has an efficiency of ε=20%, find the average heat flow into the engine in each cycle.

Qh= ? J/cycle

I need the answers to b, c, and d

Explanation / Answer

3600/60 = 60cycles/sec * 10 = 600 cycles

wnet/cycles = 14963.3 J/cycle

if your equation is u = w/q, then q = 4.489*10^7 J

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