a lost puppy of 5 kg is 25 m away from his owner of 90 kg. What is the gravitional attraction between the two

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.

Electric force between two charged object varies inversely as the square of distance between them (coulomb's law). this means if two charged objects move away force between them decreases.

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False.torque should be the product of force and the distance between the pivot point and the force location, not the "distance through which a force moves". i'd say the definition is more suited for work.