Determine the (a) cutting power, (b) force, and (c) time for the following cut made on a lathe:  initial part diameter = 45 mm  final part diameter = 40 mm  length of cut = 350 mm  feed rate = 0.3 mm per revolution  work piece rpm = 4800  specific cutting energy = 3.2 w-s/mm3

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.