# Math

A square based brass plate is 2 mm high and a mass of 1.05kg.the density of the brass is 8.4g/cm. Calculate the length of the plate in cm

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1. Di you mean 8.4 g/cm ³ ?
If so, you'd use mass / density = volume:
1050 g / 8.4 g/cm ³ = 125 cm ³
Then divide out the 2 mm height to get the area of the square side or the plate:
125 cm ³ / 0.2 cm = 62.5 cm ²
Finally square root that to get the side length of the square:
√ 62.5 cm ² = ? cm

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2. D = M/V = M/L*W*h.
D = 1050/LW*0.2 = 8.4
5,250/LW = 8.4,
LW = 625 cm^2.
L = W = sqrt(625) = 25 cm.

62

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