Two particles P and Q are shot vertically upwards. Particle P is first shot up with a velocity of 40m/s. After 4s, Particle Q is also shot up. Find: a)Where the two particles meet, If at the point of meeting, P has a velocity of 15m/s. b)The velocity with which Q is shot up.(g= 10m/s)

From negative to negative

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.