Whick of the following quantities are vectors? a. the velocity of a sports carb. temperaturec. the volume of water in a cand. the displacement of a tennis player from the backline of the court to the nete. the height of a building

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

Aforce of 240.0 n causes an object to accelerate at 3.2 m/s2. what is the mass of the object?

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.