A ball of clay is thrown at a wall at a velocity of 39.0 m/s. After it hits the wall, it takes 0.030 s to stop. What is the
acceleration of the clay when it hits the wall?

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

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.