Ask Questions Action and reaction force pairs are all around you, but they aren't always obvious. Write down a question about a situation in which you can't identify what force pairs are at work.

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

How is the gravitational force related to the distance between two objects?

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.