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hole in a steel plate
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A machinist bores a hole of diameter 1.35 cm in a steel plate at a temperature of 26.5 degree celsius .1. What is the cross-sectional area of the hole at 26.5 degree celsius?unit: cm^22. What is the cross-sectional area of the hole when the temperature of the plate is increased to 160 degree... 示更多 A machinist bores a hole of diameter 1.35 cm in a steel plate at a temperature of 26.5 degree celsius . 1. What is the cross-sectional area of the hole at 26.5 degree celsius? unit: cm^2 2. What is the cross-sectional area of the hole when the temperature of the plate is increased to 160 degree celsius? Assume that the coefficient of linear expansion remains constant over this temperature range. unit: cm^2 更新: Q2 should be a value
最佳解答:
1. Cross-sectional area = pi x (1.35/2)^2 cm^2 = 1.431 cm^2 2. Let a be the coefficient of linear expansion. Hence, coefficient of areal expansion = 2a New cross-sectional area = 1.431[1+ 2a(160-26.5)] cm^2 = 1.43(1+267a) 2012-11-08 14:57:22 充： Q2: you just substitute the value of coefficient of linear expansion of steel into the derived expression and obtain the answer.
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