A1.0-mol sample of an ideal gas is kept at 0.0°c during an expansion from 3.0 l to 10.0 l. (a) how much work is done on the gas during the expansion? (b) how much energy transfer by heat occurs between the gas and its surroundings in this process? (c) if the gas is returned to the original volume by means of an isobaric process, how much work is done on the gas?

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.