Amass-spring system can oscillate with simple harmonic motion because a compressed or stretched spring has which kind of energy?
a. kinetic
c. gravitational potential
b. mechanical
d. elastic potential

What is the momentum of a 2 kg object moving at 15 meters per second

Which subatomic particle has a negative charge

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)