Afuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. suppose that the material to be used in a fuse melts when the current density rises to 350 a/cm2. what diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.58 a?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

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.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?