A horse is pulling a buggy on a straight level road at a constant velocity of 18 km/hr. He is exerting 400 N of force. His velocity is

Iknow the first part it is the average star i am not 100% sure

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.

Ok? don't be a fake friend, only be friends with people that you are interested in developing a strong relationship with. don't be fake.