The picture tube in an old black-and-white television uses magnetic deflection coils rather than electric deflection plates. suppose an electron beam is accelerated through a 492-v potential difference and then through a region of uniform magnetic field 1.00 cm wide. the screen is located 11.1 cm from the center of the coils and is 54.4 cm wide. when the field is turned off, the electron beam hits the center of the screen. ignoring relativistic corrections, what field magnitude is necessary to deflect the beam to the side of the screen

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 of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

Frank just graduated from eighth grade. assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation