How much thermal energy does it take to raise the temperature of 4.5 kg of water from 12°C to 97° C? The specific heat of water is 1.68 kJ/(kg*^ C) Use Q=mg(T f^ - T i ) .

Air enters a compressor operating at steady state at 1.05 bar, 300 k, with a volumetric flow rate of 93 m3/min and exits at 12 bar, 400 k. heat transfer occurs at a rate of 15.5 kw from the compressor to its surroundings. assuming the ideal gas model for air neglecting kinetic potential energy effects, determine the power in put in kw.

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.