Aspring (k = 600 n/m) is at the bottom of a frictionless plane that makes an angle of 30° with the horizontal. the upper end of the spring is depressed 0.10 m, and a 2.0-kg block is placed against the depressed spring. the system is then released from rest. what is the kinetic energy of the block at the instant it has traveled 0.10 m and the spring has returned to its uncompressed length?

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.