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In Chapter 3 we assumed that, whenever fins are attached to a base material, the base temperature is unchanged. What in fact happens is that, if the temperature of the base
(a) Assuming that the occupants' body heat provides a continuous source of 320 W within the igloo, calculate the inside air temperature when the outside air temperature is Too = -40 C. Be sure to consider heat losses through the floor of the igloo.
(b) Using the thermal circuit of part (a), perform a parameter sensitivity analysis to determine which variables have a significant effect on the inside air temperature. For instance, for very high wind con- ditions, the outside convection coefficient could double or even triple. Does it make sense to con- struct the igloo with walls half or twice as thick?
A cutting tool (0.250in wide, rake angle 5 degrees) is used to machine in orthogonal mode. the depth of cut is 0.010in and the chip thickness is 0.027in. Calculate the shear angle and coefficient of friction at the tool and chip interface?
a thin plate moves between two parallel horizontal stationary flat plates at a constant velocity of 5 ms.the two
for one-dimensional steady state conduction in cylindrical or spherical shell without heat generation is the radical
design a chain drive for a steam turbine driving a centrifugal pump. the input speed is 2200 rpm and output is around
A paper airplane is thrown up a hill with slope theta = 16.26 deg during a rainstorm. The airplane has an initial speed of 10 ft/s and is fired at an angle of phi=32.52 deg from the horizontal. Rain accumulation on the wings results in a vertical acc..
Super-heated water steam at 6 MPa and 400C enters a turbine with a velocity 50 m/s. It leaves the turbine at 70 kPa and 90% quality with a velocity of 200 m/s. The mass flow rate of steam is 20 kg/s. The rate of heat loss from turbine to surroundings..
a frisbee in flight has lift and drag coefficients of cl and cd respectively where the reference area a is the frisbee
Air expands through a turbine operating at steady state on a test stand. At the inlet, p=50 psia, T=1500 degrees R, and at the exit , p=14.5 psi. The volume flow rate of air entering the turbine is 2000 ft^3/min, and the power developed is measured a..
a rigid insulated vessel is divided into two compartments connected by a valve. initially one compartment occupying one
the african elephant has developed the pinna or external ear that functions as a radiator-convector. the pinna can be
a corroded metal plate was found in a submerged ocean vessel. the original dimensions of the plate were 25 x 10 x 5 cm.
a large tower is to be supported by a series of steel wires.it is estimated that the load on each wire will be 11100N. determine the minimum required wire diameter assuming a factor of safety of 2 and a yield strength of 1030MPa.
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