A heat engine operates between 500C and 250C.
a) Calculate its maximum effeciency. (ans: 32.3%)
b) How much heat must be input to produce a work output of 750 J ? (ans: 2320 J)

Question

A heat engine operates between 500C and 250C. 
a) Calculate its maximum effeciency. (ans: 32.3%) 
b) How much heat must be input to produce a work output of 750 J ? (ans: 2320 J)

anonymous · Answer

a) see Carnot cycle
$$\eta=1-T_c/T_h=50$$

anonymous · Answer

that's is what i thought, but the answer provided says answer is 32.3%

Also, what about part b?

anonymous · Answer

$$\eta=W/Q$$

anonymous · Answer

using given 23% you will get that Q.
but I think 50% is right

anonymous · Answer

sorry 32.2%

anonymous · Answer

with the information given it has to be 50? must be a mistake

anonymous · Answer

right

anonymous · Answer

hey man thanks I really appreciate your time. just needed some validation.

anonymous · Answer

you are welcome