A load of mass 120kg is raised vertically I lood
of mass 120lag
Ventially through height of 2m is 30
by a machine whose reary is lood Cat
Calculate the power
Machine [g= loms"221
gonreded by the

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n

The magnets are probably damaged or there not strong enough to attached to the refrigerator

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.