An initially motionless test car is accelerated uniformly to 135 km/h135 km/h in 8.58 s8.58 s before striking a simulated deer. The car is in contact with the faux fawn for 0.635 s,0.635 s, after which the car is measured to be traveling at 82.0 km/h.82.0 km/h. What is the magnitude of the acceleration of the car before the collision

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.

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

Which of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging