In a two dimensional space Charge 41= +6C is placed at (0,0)m Charge
92= +7C is placed at (8,4)m Charge
93= -4pc is placed at (4,4)m. The
electrostatic potential energy of the
system is

Which two objects have the greatest gravitational force acting between them

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

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.