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1. A very long electrical conductor 10 mm in diameter is concentric with a cooled cylindrical tube 50 mm in diameter whose surface is diffuse and gray with an emissivity of 0.9 and temperature of 27°C. The electrical conductor has a diffuse, gray surface with an emissivity of 0.6 and is dissipating 6.0 W per meter of length. Assuming that the space between the two surfaces is evacuated, calculate the surface temperature of the conductor.
2. Liquid oxygen is stored in a thin-walled, spherical container 0.8 m in diameter, which is enclosed within where q12,N and q12,0 represent the radiation heat trans- fer rates for N shields and no shields, respectively.
Compute the total volume V displaced by the chamber - The submersible diving chamber has a total mass of 6.7 Mg including personnel, equipment, and ballast.
It takes 15 revolutions of the screws for the full range motion necessary to unload/load a work piece. The DC motor constant, KM, is 0.6 rev/V/s and there is a 20 Volt power supply. Assuming a constant proportional control gain, KP of 4 volts/rev, ho..
A steel plane of finite dimension and thickness of 13 mm has the initial (uniform) temperature of 35 C. put the plane into the solution in all sudden and the wall temperature is increased to 146 C spontaneously. The thermo diffusivity of the plane, i..
You have a 2 dimensional (just X&Y) square plate with sides measuring a=24. The upper and lower sides of the plate are perfectly insulated, but the right and left sides are not. The left side is kept at 0°C and the right side is kept at f(y) °C. Find..
a liquid spray nozzle is designed to produce a specific size droplet with diameter d. the droplet sized depends on the
A residential heat pump has a coefficient of performance of 2.6. How much heating effect in Btu/h will result when 4.6 hp is supplied to the heat pump?
air flows through a well-insulated nozzle operating at steady state. at the inlet the pressure is 5 bar the temperature
Titanium is stiffer than aluminum, has a lower thermal expansion coefficient than aluminum, and has a higher melting temperature than aluminum. On the same graph, carefully and schematically draw potential well curves for both metals. Be explicit in ..
suppose that a nuclear plant generates heat in the amount of 2 x 107 j from its fuel rods at a temperature of 1200c and
a uniform sphere is projected without rotation at speed v0 up an inclined plane the makes an angle theta with the
A ship A is travelling at a speed of 30 km h 1 in a direction 60 ° south of east. A second ship B is sighted which is travelling at 20 km h 1 in a direction 30 ° east of north. What is the apparent velocity of ship B when viewed from ship A?
A steel tie bar in a structure is initially 2 m long and 25 mm diameter. What will be the change in length and diameter when carrying a tensile load of 100 kN? The modulus of elasticity is 200 GPa and Poisson ' s ratio is 0.33.
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