A 5-cm-diameter copper sphere is initially at a uniform temperature of 200C. It is suddenly exposed to

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A 5-cm-diameter copper sphere is initially at a uniform temperature of 200ºC. It is suddenly exposed to an environment at 20ºC having a heat-transfer coefficient h = 28W/m2·ºC. Using the lumped-capacity method of analysis, calculate the time necessary for the sphere temperature to reach 90ºC.
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Heat Transfer

ISBN: 978-0073529363

10th edition

Authors: Jack Holman

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