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1) A pot such made by Revere Copper ("Revereware") has two different metals composing the bottom of the pan- a stainless steel pan "body" with a copper base formed to the pan on the outside or burner contact surface. Why do you think this is done? Based on discussions in the book, do you think the heat transfer coefficient will be better with the copper bottom over the stainless steel pan, or is it there "just for show"? Would a bare stainless steel pan actually have a better heat transfer coefficient? Think this one through!
2) During a warmer winter or early spring day, wind at 40 deg.F is blowing at a speed of 40 mph parallel to a 12 foot high by 30 foot long wall of a house. Assuming the interior wall surface is 55 deg. F, find the rate of heat loss through the wall by convection.
3) You are working on a test using a 50 cm. long by 2 cm. diameter electric heating element. The element's exterior surface is polished aluminum (very low emissivity). The heating wire in the element is placed at the center of the tube and runs the length of the element. Both ends are well insulated, so you are only concerned with what happens at the cylinder surface. The element is powered with a constant 40 watt energy flow for the test period. If the surface temperature of the element is measured to be 120 deg.C and the surrounding air temperature is 20 deg. C, determine the natural convection heat transfer coefficient?
Explain Slip-ring Slip-ring (or phase- wound) rotor having of a slotted laminated core of sheet steel. A three- phase winding is placed in the rotor slots. The rotor windin
Q. A truck loaded with sand accelerates along a highway. If the driving force stays the same on the truck, what happens to the truck's acceleration if its trailer leaks sand at a
Advantage and disadvantage of liquid in Glass thermometer
a car of mass 800kg is pulling a trailer 300kg where sin a=1|200.Resistance to motion(apart from gravity) is 1.5N per kg of mad for each vehicle.calculate the pulls of the engine
What is electric flux? Write its S.I. units. Using Gauss's theorem, assume an expression for the electric field at a point because of a uniformly charged infinite plane sheet.
Q. State the fundamental postulates of special theory of relativity? The two basic postulates of the special theory of relativity are: (i) The laws of Physics are the simila
Some wire of cross-sectional area 1mm 2 has a resistance of 20 ?. Determine (a) the resistance of a wire of the same length and material if the cross-sectional area is 4mm 2 ,
Materials are an essential part of an engineering study. An engineer requires materials to provide shape to his concept and design. Selection of the right material job in the first
A coil of inductance 318.3mH and negligible resistance is linked in series with a 200 resistor to a 240V, 50Hz supply. Calculate (a) The inductive reactance of the coil,
In a perfect instrument the zeros of the major scale and circular scale coincides with each other, in that situation screw gauge has zero-error, or else the measurement device is s
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