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bpinto
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Homework Statement
In general, the density of a three dimensional object is expressed as mass per unit volume. However where an object is of uniform thickness its depth can be combined with the density factor allowing the density to be expressed in terms of mass per unit area. A pair of steel disks joined together are of uniform thickness and each has an area density of 10 grams/cm2
Homework Equations
ρ = m/A
The Attempt at a Solution
Mass of bigger disc
10 = m/25∏
Mass of smaller disc
10 = m/4∏
Total mass = 290∏
I don't have any idea what I am doing wrong as the answer is suppose to be 58∏
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