00:01
Hi, so to solve for this, remember that the formula for density is mass over volume.
00:15
So our unknown here is the mass of the sphere.
00:17
So rearranging this equation, we'll have density multiplied by the volume.
00:21
But do we have the volume of the sphere? not yet.
00:24
We have here the radius, so that means we will solve first for the volume.
00:29
So volume of the sphere, the formula for volume of a sphere is 4 3rds pi r, the radius raised to the power of 3.
00:38
So let's plug in the information that we have.
00:41
Radius is 28 .4 cm raised to the power of 3, and this will give us 95 ,949 .70 cubic centimeters.
00:54
So now let's solve for the mass...