If the lifting cable of a hoist lifts a 250-lb engine times 250 lb, or 1,000 foot-pounds of work.
in the air, the amount of work done is equal to 4
Select one:
A. 5
B. 2
C.3
D.4

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Amass-spring-viscous damper system of mass 3 kg has a frequency of 100 rad/s and is critically damped. its initial conditions are x(0)-3 mm and (0)-2.3 m/s. does the system overshoot its equilibrium position? prove your answer

Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump