How many moles of air are in an inflated basketball? Assume that the pressure in the ball is 210 kpa, the temperature is 325 K, and the radius of the ball is 0.2 m

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?