A body at rest is given an initial uniform acceleration of 8.Om5' for 30sec after
which the acceleration is reduced to 5.0m5for the next 20 sec. The body
maintains the speed attained for 60sec after which it is brought to rest in 20 sec.
Draw the velocity-time graph of the motion using the information given above.

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.

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.