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The inside dimensions of a refrigerated box is 2m x 1 m x 1.2 m. It is covered with insulation 50 mm thick and then a liner 5 mm thick. It is required to extract 150 W from the box. Simplifying the problem to a plain flat surface calculate the inside temperature when the outer surface is maintained at 20oC. The thermal conductivity of the insulation is 0.043 W/m K and 0.2 W/m K for the liner.
a diesel cycle works on compression ratio of 18 and temperature at the start of compression is given as 300k. take cut
the measured lapse rate at a given location was 3.8 degree f per 1000 ft and the surface temperature was 60 degree f.
a four-cylinder four-stroke 2.2 liter gasoline engine operates on the ideal otto cycle with a compression ratio of 10.
a refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration
a thin plastic membrane is used to separate helium from a gas stream. under steady-state conditions the concentration
Draw the stress distribution along the walled thickness and discuss whether the composite with the applied pressure is safe or not by using von-Mises and Tresca theory.
a 40 mm diameter hole is drilled 3 m deep into the steel shaft. when the two torque are applied determine a the maximum
To Verify the law for parallelogram of forces, law for triangle of forces and law of polygon of forces. These laws are very useful to calculate unknown forces in very short time.
the lower end of the 30 kg slender rod is displaced a small amount and released from the rest. determine the natural frequency of vibration. the springs have stiffness of 500 N/m and they are stretched when the rod is hanging vertically.
a rock climber of weight w has a rope attached a distance h below him for protection. suppose that he falls and assume
a frisbee in flight has lift and drag coefficients of cl and cd respectively where the reference area a is the frisbee
a mixture of nitrogen and carbon dioxide with a carbon dioxide mass fraction of 50 percent has a constant-volume
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