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A hollow sphere is constructed of aluminum with an inner diameter of 4 cm and an outer diameter of 8 cm. The inside temperature is 100 C and the outer temperature is 50 C. Suppose the sphere is covered with a 1-cm layer of an insulating material having k= .05 W/m C and the outside of the insulation is exposed to an enviroment with h= 20 W/m2 C and T∞ = 10 C. The inside of the sphere remains at 100 C. Calculate the heat transfer under these conditions.
A gear blank has been successfully hot forged on a mechanical press in a closed die. At the beginning of a new production run
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a spring is stretched 200mm by a 15kg block. if the block is displaced 100mm downward from its equalibrium position and
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consider a model of a bone with a cemented prosthesis where the outside radius of the bone is ro the radius of the
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Derive at least four concept designs to satisfy the given specification - draw a central cross-section of the heat exchanger
a 12-kg solid whose specific heat is 2.8 kjkg degree c is at a uniform temperature of -10 degree c. for an environment
let x denote the sum of the face values of a die rolled twice i.e. the outcome of this experiment is the sum. assume
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