On the planet zorag, angel drops a 5 kg rock from a space shuttle hovering 10 meters high. the rock does 300 n*m of work on the way down. what is the acceleration due to gravity on planet zorag?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

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.