Aplanet has a mass of 5.68 x 1026 kg and a radius of 6.03 x 107 m. what is the weight of a 65.0 kg person on the surface of this planet?
a.
636 n
c.
475 n
b.
678 n
d.
656 n

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)

Give an example in which the electrical energy changes to light energy

Which of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging