Answer:1200
Explanation:
Given data
Upper Temprature
Lower Temprature 
Engine power ouput
Efficiency of carnot cycle is given by





rounding off to two significant figures

Answer:
I think its B. James would have a smaller mass on the Moon than he does on Earth.
sorry if i did it wrong
The stone's altitude at time
is given by

where
is the acceleration due to gravity. The stone reaches the ground when
:
