The gravitational acceleration is 9.81 m/s2 here on earth at sea level. what is the gravitational acceleration at a height of 350 km above the surface of the earth, where the international space station (iss) flies? (the mass of the earth is 5.97×1024 kg, and the radius of the earth is 6370 km.)

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.

What is the rate of change in a objects position?

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic