A cyclist moves a distance of 30 m from points A to B in a straught line towards East with a speed of 10 m/s. He then moves a distance of 40 m from points B to C in a straight line towards North with a speed of 20 m/s. Calculate the cyclist's (1) Average Speed, (2) Average Velocity, for the whole journey

What happens to the light rays when they hit the specimen?

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

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.