Ascientist studies how sunlight affects a person's skin. which of the following is a testable question about this topic? a, does being in the sun make your skin dry? b. do people look better when they have a suntan? c. what is the most enjoyable time to be in the sun? d. should children be allowed to lie in the sun?

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.