Four model rockets are launched in a field. The mass of each rocket and the net force acting on it when it launches are given in the table below.
Rocket
Mass (kg)
Force (N)
1
4.25
120
2
3.25
120
3
5.50
120
4.
4.50
120
Which rocket has the highest acceleration?
A. Rocket 2
B. Rocket 4
C. Rocket 3
D. Rocket 1

The answer would be a) -80of

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.