A rod of length L0moves with speed valong the horizontal direction. The rod makes an angle θ0with respect to the x′ axis.(a) Determine the length of the rod as measured by a stationary observer in terms of L0, v, c and θ0.(b) Determine the angle θ0the rod makes with the xaxis.

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.