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Athermometer having an emissivity of 0.9 is placed in a large room and indicates a temperature of 25?C.The walls of the room are at 35?C and the convection heat transfer coefficient is 5.0 W/m2 · ?C. Calculate the true temperature of the air.
a brayton cycle inlet is at 300 k 100 kpa and the combustion adds 670 kjkg. the maximum temperature is 1200 k due to
suppose hat 3 lbm of a gas are compressed from 14.7 psia and 70 f to 60 psia in a process such that pvn constant where
A 75 kg metal block initially at 80 degrees Celsius is dropped into a well insulated tank that contains 50 kg of water at 1 atm pressure and 20 degrees Celsius. The metal block and water are allowed to reach thermal equilibrium at a temperature of 35..
determine diameter of a circular rod of ductile material with a fatigue strength ,e=280 Mpa. Add a tensile yield strength of 350 Mpa. The member is subjected to a varying axial load from 700 kN to -300kN. Assume Kt=1.8 and factor of safety=2.
A closed system undergoes a process in which work is done on the system and the heat transfer Q occurs only at temperature Tb. For each case, determine whether the entropy change of the system is positive, negative, zero, or indeterminate.
1. Answer the following true or false. Explain. (a) Work is done by a system on its surroundings if the sole effect on everything external to the system could have been the raising of a weight. (b) Cooling of computer components achieved by a fan-i..
How can we rotate a disc hanged with weights freely without external effects other then gravitational force cont?
A steady-state, well insulated turbine operated in two stages in series using steam . The first stage has an efficiency of 85% and the second stage 90%. Steam enters the first stage at 400 C degree and 4 MPa and exits at 1.5 MPa.
a 6-cylinder 3.8 l spark ignition engine operating on the ideal otto cycle takes in air at 104 kpa and 20 degrees
Consider the vorticity sheet that sheds from the trailing edge of a wing. Briefly explain the type of deformation this sheet undergoes with stream wise distance in an in viscid context, and the mechanism responsible for this deformation.
an air-conditioner with refrigerant 134a as the working fluid is used to keep a room at 26 c by rejecting the waste
Knowing that the couple shown acts in a vertical plane, determine the stress at (a)point A. (b) point B.
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