Agymnast is swinging on a high bar. the distance between his waist and the bar is 0.905 m, as the drawing shows. at the top of the swing his speed is momentarily zero. ignoring friction and treating the gymnast as if all of his mass is located at his waist, find his speed at the bottom of the swing.

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)