Find the polytropic exponent and work
A cylinder/piston contains a saturated vapor R-410a at 10 C; the volume is 10 L. The R-410a is compressed to 2MPa, 60 C in a reversible (internally) polytropic process. Find the polytropic exponent n ans calculate the work and heat transfer.
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A 30-cm-diameter, 5-m-long steam pipe passes through a room where the air temperature is 20 C. If the exposed surface of the pipe is a uniform 40 C, find the rate of heat loss from the pipe to the air if the surface heat-transfer coefficient is 8.
State the null and alternate hypotheses, state whether the null hypothesis should be rejected or not rejected and your reason for that conclusion, state the meaning of that conclusion specifically in terms of the problem being studied.
Refrigerant 134a at 700 kPa and 40oC is expanded adiabatically in a closed system to 60 kPa. Determine the work produced, in kJ/kg, and final enthalpy for an isentropic expansion efficiency of 80 percent.
Determine the instantaneous rate of heat transfer from a 1.5-cm-diameter ball bearing with a surface temperature of 150 C submerged in an oil bath at 75 C if the surface convective heat transfer coefficient is 850 W/m^2 * C.
The R-410a is compressed to 2MPa, 60 C in a reversible (internally) polytropic process. Find the polytropic exponent n ans calculate the work and heat transfer.
Find the critical value. Assume that the test is two-tailed and that n denotes the number of pairs of data. n = 60, = 0.05
Assuming negligible internal resistance, derive a differential equation that could be solved to determine the rod temperature as a function of time during the heating process.
A plane wall, 7.5 cm thick, generates heat internally at the rate of w/m^3. One side of the wall is insulated, and the other side is exposed to an environment at 90 degrees celsius.
A manometer connected to the tap shows a head of 0.14 in. of mercury above atmospheric. Determine the approximate speed of the air leaving the nozzle if it is at 40°F and 14.7 psia.
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