The helium produced from the fusion of hydrogen has less mass than the hydrogen that goes into its formation. What happens to the missing matter?

The objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

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