What is the effective spring constant of the bungee cords in the Bungee Cord Bounce if a 70 kg person falls from rest (with loose bungee cords) a distance of 4.15 meters to the surface of the trampoline, and is moving downward at 3.80 cm/sec at that point in time?

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.