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A wall has inner and outer surface temperatures of 16 and 6°C, respectively. The interior and exterior air temperatures are 20 and 5°C, respectively. The inner and outer convection heat transfer coefficients are 5 and 20 W/m2 · K, respectively. Calculate the heat flux from the interior air to the wall, from the wall to the exterior air, and from the wall to the interior air. Is the wall under steady-state conditions?
in a rolling operation material a 8 inches wide and 2 inches thick was reduced to the maximum extent possible in a
Compare the flexibility of a 0.01-in. diameter steel wire to a 0.02-in. diameter aluminum wire. The Young's modulus of steel is 30 Msi and that of aluminum is 10 Msi.
Diffusion in liquids commonly assumed a rigid sphere in a continuum. When would this model be most accurate?.When could it fail? Diffusion varies with viscosity to the (+1) power in gases but to the (-1) power in liquids. Why?
The open-loop gain A of real (nonideal) op-amps is very large at low frequencies but decreases markedly as frequency increases. As a result, the closed-loop gain of op-amp circuits can be strongly dependent on ω = 4 × 103 rad/s determine
The MATLAB code for plotting the mode shapes and to find the first natural frequency of a system given below: System: A cantilevered beam with fixed-free ends and a lumped mass on the free end.
At one section in an air distribution system, air at 14.7 psi and 100degree F has a velocity of 1200 ft/min a and the duct is 12 in x12 in square. At another section the duct is round with a diameter of 18 inches and the velocity is 900 ft/min. Calcu..
If all of the polymer chains are the same length, calculate the molecular weight of the chains, and
1. For the isentropic flow of an ideal gas with constant specific heat ratio k, the ratio of the temperature T* to the stagnation temperature To is T*/To 5 2/(k 1 1). Develop this relationship.
a man pushes on a 60-lb crate with a force f.the force is always directed down at a 30 degrees from the horizontal and
a piston-cylinder contains 0.1kg of superheated steam at 180 degrees celsius and 5 bars. the pison is frictionless and
a household refrigerator that has a power input of 80w assume constant work input over time and a coefficient of
an automobile can accelerate at the rate of 1.5ms2 and can decelerate at 7ms2. if driver never exceeds the speed limit
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