Question

the output enery of real life machine is less than input energy because of :
a) moving parts of machine
b) friction at a moving part
c) both a and b
d) none of these
???​

Answer 1

Explanation:

Because some of the work input to a machine is always used to overcome friction, the work output of a machine is always less than the work input.

hence (C) will be right answer

Answer 2

Answer:

(d) none of these

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