When developing an experimental design, which action would improve the quality of the results?
A. Ensure that it answers a question about cause and effect.
B. Include as many responding variables as possible.
C. Keep the sample size of test subjects to a minimum.
O
D. Have a different researcher make the measurements.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

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)

Which of the following statement is false