a rectangular solid block of dimensions 20 cm by 15 cm by 10 cm has a cylindrical hole bored through its centre.the mass of the block is now 14.9 kg and the material of the block has a density of 5 g cm(-3).what is the cross-sectional area of the hole in cm(2)?
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The block... without the hole... "should have" a mass of 20cm x 15cm x 10cm x 5 g/cc.It "should" have a mass of 15,000 g. It doesn't. It has, instead, a mass of 14,900 g. The hole must have removedthe missing 100 g.Since the density is 5 g/cc, the volume ofthe hole be 20 cc. Volume of a cylinder = Pixr^2 x height.Here's the problem: The height of the cylinder... that is, the length of the hole depends upon what surface of the block was drilled. The hole could be 10, 15 or 20 cm long.
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