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A stainless steel plate 1.6cm thick rests on top of a hot plate, which is maintained at 250C. Air flows over the top of the surface of the plate to provide a convective heat-transfer coefficeint of h = 50W/m^2K. The air temperature is maintained at 20C.
a. What is the heat flux through the stainless steel plate, in W/m^2?
b. What is the temperature at the top surface, T1, of the stainless steel plate?
c. Based on the anaysis above, what can you conclude about the heat transfer resistance offered by the hydrodynamic boundary layer?
During a hot air balloon race one specific balloon, initially at rest, accelerate vertically upward at a constant rate of a=4.5 ft/s^2 when t0=42 s from the ground the surface, which is at an altitude above mean sea level of s0=3750 ft.
Discharge from an orifice of 75mm diameter is 0.02 m^3/s under a constant head of 3 m. An external mouthpiece of the same diameter is installed that raises the coefficient of contraction from 0.63 to 1.0.
A plumber places his hands 18 inches apart on a pipe threader and can push (and pull) with 80 lb of force. What couple moment does he exert? How much could he exert if he moved his hands to the ends so that his hands are 254 inches apart?
Write out the continuity and momentum equations that govern the surge travelling downstream. (Note: assume that the surge velocity exceeds the water velocity)
a piston moves a 25kg hammerhead vertically down 1m from rest to a velocity of 50m/s in a stamping machine. what is the total change in energy of the hammerhead
A proposed square footing 2 meters by 2 meters carrying a total load of 800 kN is to be constructed on a sand deposit. The depth of the footing will be 1 meter below the ground surface
The footing has a f'c=3000psi. Assume the the footing base is 5 ft below the grade and the soil is 100 lb/ft with an allowable pressure of 4500lb/ft fy=60,000
The point of dicharge is 5 m abovethe floor, and friction losses in the 50 mm pipe from the resevoirto the tower amount to 2.5 J/kg. At what height in the resevoirmust the water level be kept if the pump can deliver only 0.1kW
How much energy is stored in an isolated spherical capacitor of radius ,R=25 cm, if it is charged to a potential of 5000V?
Create a depreciation schedule showing annual depreciation amounts and end-of-year book values for a $26,000 asset with a 5 year service life, using the MACRS depreciation method.
A sample of coarse aggregate weights 1072 grams when oven-dried, 1091 grams when saturated surface-dried, and 667.6 grams when submerged. Calculate the bulk specific gravity, apparent specific gravity, and percent absorption.
The modules of elasticity of the wood is 12 GPa. If one side of the column is 25 cm across, find the minimum dimension of the other side to keep the column's deformation under 1.3 mm.
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