Which situation most clearly presents an example of Newton's third law of motion? A. When a car runs into a stop sign, the stop sign will get knocked down.

B. When a girl on roller skates throws a basketball forward, she will roll backwards.

C. When dropped to the floor, a basketball stops after four bounces.

D. The heavier a rolling cart is, the less it will roll when a person pushes it.

Why there is no inductive reactance in dc circuits

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

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.