Apiston–cylinder device initially contains 0.07 m3 of nitrogen gas at 130 kpa and 180°c. the nitrogen is now expanded to a pressure of 80 kpa polytropically with a polytropic exponent whose value is equal to the specific heat ratio (called isentropic expansion). determine the final temperature and the boundary work done during this process.

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.