A 1.3-kg block is pushed up against a stationary spring compressing it a distance of 4.2 cm. When the blocks spring is released, the spring pushes it away across a friction less horizontal surface. What is the speed of the block, given that the spring constant is 1400 N/m

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)