Aremote control for a television works by sending out electromagnetic waves. which is the best description for the behavior of the waves?
a. the speed of the waves changes as it moves through the air, so the waves refract and diffract.
b. the remote control sends out longitudinal waves, which then echo off the television detector.
c. transverse waves from the remote transmit through air, which are then absorbed by the television detector.

Protons and neutrons are found within the nucleus of an atom

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.

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm