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Volume of a cylinder is pi*r^2*h. That gives us pi*.003^2*1 = 28.274 * 10^-6 m^3.

We know the density of steel is 7850 kg/m^3, so simply multiplying the two numbers together gives:

.222 kg or 221.95 grams

Technically, the way the question is worded, .2 kg or 200 grams is as accurate as we can get, because the question only gives one significant figure.

Volume of a cylinder = [π x Ø2] x Height

4

Diameter Ø = 6 mm / 0.006 meter

Height = 1000 mm / 1 meter

Volume of a cylinder = [π x 0.0062] x 1= 0.000028274

4

Density of steel = 7850 kg/m3

Weight of 1 meter steel rod = 0.000028274 x 7850 = 0.221 kg

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14y ago

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