A child slides down a slide at a constant speed of 1.5 m/s. The height of the slide is 3.0 m. Write down the equation for conservation of energy, noting the choice of system, the initial and final states, and what energy transformation has taken place.

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.

D. the index of refraction of the second medium is lower.

Answer a descending mass of air will have its temperature increase because of the pressure exerted on it, because its temperature increases it will also be able to hold more water and feel drier;