Ear i. P- Outer ear detects sound from the surroundings
ii. Q - Ear drum converts sound into a sensory impulse
iii. R - Inner ear receives vibrations from the ear drum
and sends it to the brain
iv. S - Damaged ear drum can impair hearing
Which of the following are true regarding human ear?
a. Only P and Q
b. Only P, Q and S
c) Only P, R and S
d) All P, Q, R and S​

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)