A flat circular plate of copper has a radius of 0.425 m and a mass of 65 kg. What is the thickness of the plate? Answer in units of m. I would like you to guide me to the answer. I switched the numbers up so they are not the exact as on my paper (: Thanks.

Question

anonymous · Answer

first you need the density of copper
and then multiply it by the area of the plate

anonymous · Answer

Density of copper is 8.9. Check.

anonymous · Answer

the area of the plate is (pi)r^2
so (.425m)^2 (pi)

anonymous · Answer

.180625pi meters squared=area

anonymous · Answer

density is 8.9 kg/m2? or g/m2?

anonymous · Answer

No wait! I take that back o: I am confusing mystel. 8.9=g/cm^3
And 8900=kg/m^3

anonymous · Answer

The thickness times area is volume.  times the density is the mass.
you are given mass so the thickness is equal to the density divided by area

anonymous · Answer

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