Amass of 1 slug is suspended from a spring whose spring constant is 9 lb/ft. the mass is initially released from a point 1 foot above the equilibrium position with an upward velocity of 3 ft/s. find the times for which the mass is heading downward at a velocity of 3 ft/s. (enter your answers as a comma-separated list. let n represent an arbitrary integer.)

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.