A cyclist travels 21 km in 90 minutes. Calculate, in m s–1 , the speed of the cyclist.

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline

The force it would take to accelerate an 900-kg car at the rate of 6m/s2