Atable- tennis ball is thrown at a stationary bowling, the table tennis- ball makes a one- dimensional elastic collision and bounces back along the same line. compared with the bowling ball after the collision does the table- tennis have a) a larger magnitude of the momentum and more kenetic energy. b) a smaller magnitude of momentum and kenetic energy. c) a larger magnitude of momentum and less kenetic energy d) a smaller magnitude of momentum and less kenetic energy e) the same magnitude of momentum and the same kenetic energy

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

What is the length x of the side of the triangle below? (hint: use the cosine function)

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.