Afancart of mass 0.8 kg initially has a velocity of < 0.9, 0, 0 > m/s. then the fan is turned on, and the air exerts a constant force of < -0.3, 0, 0 > n on the cart for 1.5 seconds. what is the change in momentum of the fancart over this 1.5 second interval? = < , 0, 0 > kg

Atwo-stage air compressor operates at steady state, compression 10m^3/min of air from 100 kpa and 300k to 1200 kpa. an intercooler between the two stages cools the air to 300k at a constant pressure of 350 kpa. the compression processes are isentropic. a) calculate the power required to run the compressor, in kw b) compare the result to the power required for isentropic compression from the same inlet state to the same final pressure.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.