willem has to measure the specific heat capacity of copper. He has a copper block , which he heats with an electrical heater. The heater supplies energy to the block at 50J/ sec . A) What two other measurements will he require in order to calculate the heat capacity of steel. B) Explain why the block must be well insulated if he is to obtain an accurate result. C) If the block is poorly insulated . will Willems result be too high or too low.

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.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

There are two routes similar in terrain; however, one route has an incline of approximately 28 degrees, and you must decide on which route to take. what is the maximum road grade that your fully loaded ecv can climb?