A spring suspended vertically is 17.6 cm long. When you suspend a 25 g weight from the spring, at rest, the spring is 21.0 cm long. Next you pull down on the weight so the spring is 23.5 cm long and you release the weight from rest. What is the period of oscillation?

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)