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2.51 a body whose surface area is 0.5 m2 ,emissivity is 0.8 and temperature is 150 , is placed in a large evacuated chamber whose walls are at 25 c. What is the rate at whish radiation is emitted by surface in W? what is the net rate at which radiation is exchanged between the surface and cammer walls in W?
two wires have the same length and the same resistance. one is made from gold and the other from tungsten. obtain the
a 2 m3 tank containing nitrogen at 25oc and 500kpa is connected through a valve to another tank containing 3kg of
determine the volume required to store 25kg of ethane at 320kpa and 35 degrees celsius. if the temperature rises to 65
Draw the T-s diagram (hint: it would help to begin with a schematic of the cycle) and.
one cubic foot 1 ft3 of air is contained in a piston - cylinder arrangement. the axis of the cylinder is oriented in
Kinetic and potential energy effects can be ignored. Evaluate the work required and the heat transfer, each in kW.
Determine heat flow, Heat flow through a uniform wall will: a) increase as the thermal resistance increases b) increase as the thickness of the wall increases
draw the shear and bending-moment diagrams for the beam and loading shown and determine the maximum normal stress due to bending.
the walls of an insulated lunch box are made of inch-thick styrofoam with a thermal conductivity of 0.05wmk. if an ice
One kilogram of air as an ideal gas executes a Carnot power cycle having a thermal efficiency 50%. The heat transfer to the air during isothermal expansion is 50 kJ. At the end of the isothermal expansion, the pressure is 574 kPa and the volume is..
Determine the velocity ratios that can be achieved by the gear box in terms of number of teeth in the sun wheel and determine which component (out of the sun wheel, planet carrier and annular wheel) has to be used as the input shaft to get the req..
A piston-cylinder device contains 0.8kg of steam at 300 degrees C and 1 MPa. Steam is cooled at constant pressure until one-half of the mass condenses.
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