A 40 kg girl is riding in an elevator while standing on a scale. What is her apparent weight (scale reading) when the elevator is accelerating upward at 2 m/s2 ?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

State the following: boyle's law and charle's law

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.