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# Density for Geometry

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A rectangular block of copper metal weighs 54g. The dimensions of the block are 5.8cm by 3.7cm by 8.2cm. From this​ data, what is the density of

​copper? Round to the nearest tenths.

Apr 15, 2019
edited by Guest  Apr 15, 2019
edited by Guest  Apr 15, 2019

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*******Deleted********

Apr 15, 2019
edited by CPhill  Apr 15, 2019
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It said it was wrong, I'm doing MathXL homework.

Guest Apr 15, 2019
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When the weight of an object equals the weight of the water displaced (or pushed away) by the object, the object is neutrally buoyant and easy to lift to the surface.

A tanker made of 2.5\times10^3\text{ m}^32.5×103 m32, point, 5, times, 10, start superscript, 3, end superscript, space, m, start superscript, 3, end superscript of steel sank to the bottom of the ocean. The density of steel is approximately 8\times10^3\text{ kg/m}^38×103 kg/m38, times, 10, start superscript, 3, end superscript, space, k, g, slash, m, start superscript, 3, end superscript. The density of seawater is approximately 1\times10^3\text{ kg/m}^31×103 kg/m31, times, 10, start superscript, 3, end superscript, space, k, g, slash, m, start superscript, 3, end superscript. Because gravity is pretty much the same everywhere on earth, the weight of the tanker can be assumed to be approximately equal to its mass.

In kilograms, what total weight of seawater needs to be displaced in order to lift the tanker to the surface?

Apr 15, 2019