1.1 Find the resistance of 1000m of a copper wire with a cross sectional area of 25 mm2. The resistance of copper is 1/58 ohm per metre length and 1 mm2 cross-
sectional area. What will be the resistance of another wire of the same material, three
times as long and one-half area of cross section?

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.