Check my math ? gpe and power lab

Cases A and B are all correct.

In Case C, the GPE is incorrect. 
(But then, the power and HP have been correctly calculated
from the incorrect value of GPE, so we can't gig you too bad.) 

The rearrangement of particles in a physical change. hope this

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.