determine the height of a shooter if the angle of trajectory is 74 according to a skyscrayper that the shooter was in, was a distance of 140ft away from the victim who had a height of 5.52ft

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.