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7 August, 08:39

A rectangular block of wood is 3" by 4" by 5", is cut from a cubic foot of woid weighing 72 pounds. How much does the small block weigh?

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  1. 7 August, 11:19
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    The cubic foot of wood = 1,728 cubic inches.

    So a cubic inch weighs (72 / 1,728) pounds = 0.041666666 ... pounds

    3" x 4" x 5" = 60 cubic inches

    60 cubic inches *.04166666 ... pounds / cubic inch =

    2.5 pounds
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