N a physics lab experiment, a student sets up an inclined ramp on a table with two photogates 20 cm apart. A ball rolls down the ramp and the photogates read that it takes 0.25s for the ball to pass through photogates. If the end of the table is 87 cm above the floor, What is the ball’s horizontal velocity?
Where could a coin be placed so that the ball directly strikes the coin on impact with the ground?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.