iron ball bearing with circumference of 3.25mm has mass of 4.20g. calculate density of iron in g/cm3?

Question

anonymous · Answer

well circumference is volume and density is mass over volume so you just need to recalculate volume in mm3 to cm3 and divide those two numbers...

rho = m/V

jfraser · Answer

@Kryten, circumference isn't volume, but we can use radius to find volume of a sphere$$V = \frac{4}{3}\pi(r^3)$$ then plug into the equation from above

anonymous · Answer

@JFraser  then google translate didnt translate it correctly, i apologize for wrong answer...