A car slides on an icy street with no friction. It strikes a stationary car of the same mass. After the collision, the first car moves off with speed 7.5 m/s at an angle of 35o with respect to the original line of motion, and the second car moves off at an angle of -15o with respect to the original line of motion of the first car. Assuming there is no friction after the collision, find the speed of the first car before the collision.

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)