Nicole built a parachute, as seen here. She dropped the parachute from the top of the stairs, and it floated down very quickly. What design changes must she make to keep it afloat for a longer period of time?

A)Use longer threads.
B)Use a heavier clothes pin.
C)Use a larger piece of paper.
D)Use a smaller piece of paper.

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.