Why is it inaccurate to use mgy to calculate the potential energy of a satellite orbiting earth at a height one earth radius above the earth’s surface

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

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.

If the wavelength is tripled, while the speed of the wave is held constant, what happens to the frequency?