The fastest server in women's tennis is sabine lisicki, who recorded a serve of 131 mi/h (211 km/h) in 2014. suppose that the acceleration of the ball was constant during the contact with the racket. part a if her racket pushed on the ball for a distance of 0.15 m, what was the acceleration of the ball during her serve?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.