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A 5-lb roast initial at 70°F is placed in an oven at 350°F. You may assume the heat transfer coefficient is 2.5 Btu/hr.ft2. °F and the thermal conductivity of the roast can be considered the same as that of water. Roast can be considered as a spherical shape and it is consider to be cooked when the center temperature reaches 200°F. Estimate the cooking time.
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A ball is thrown vertically up with a velocity of 91 ft/sec at the edge of a 190-ft cliff. Calculate (a) the height h to which the ball rises and (b) the total time t after release for the ball to reach the bottom of the cliff.
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a cylinder subjected to internal pressure pi only is made of cast iron having ultimate tensile strengths in tension and
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