When discussing the motion of waves, how is a medium defined? Please write why beside A. a substance that creates a wave
B. a substance that damages a wave
C. a substance that a wave moves through
D. a substance that blocks a wave’s movement

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

If a simple machine reduces the strength of a force, what must be increased?

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)