A large watermelon has a mass of 125kg and is on a platform 6meters above the ground. If Dwight K. Schrute drops the watermelon off the platform, how high above the ground is it at the moment its kinetic energy is 5500J?

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?