Amotor supplies a constant torque or twist of m=120 lb•ft to the drum. if the drum has a weight of 30 lb and a radius of gyration of k0=0.8 ft, determine the speed of the 15 lb carte a after it rises s=4 ft starting from rest. neglect the weight of the cord.

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.