danyzavala
May 18, 2009, 02:45 PM
Consider a concrete sphere of mass 50 kg. Find its radius.
Perito
May 18, 2009, 02:54 PM
You need the density of concrete.
density of concrete = approximately 2400 kg/m3 (145 lbs/ft3)
\frac {mass}{density}=volume
The volume is found from the radius:
V = \frac 43 \pi r^3
Plug in the volume, solve for r.