+0

# A cube of metal side is 7cm melted down and recast in a cylindrical mould with a diameter of 3cm. How long is the cylinder of metal?

0
231
1

A cube of metal side is 7cm melted down and recast in a cylindrical mould with a diameter of 3cm. How long is the cylinder of metal?

Guest Oct 20, 2014

#1
+85644
+5

The volume of the cube = (7cm)^3 = 343cm^3

Therefore, the cylinder has the same volume (assuming no loss due to melting)...so we have

343 = pi*r^2 *h  →

343 =pi*(1.5)^2*h →

343 / [pi *(1.5)^2] = h =  about 48.52cm

CPhill  Oct 20, 2014
Sort:

#1
+85644
+5

The volume of the cube = (7cm)^3 = 343cm^3

Therefore, the cylinder has the same volume (assuming no loss due to melting)...so we have

343 = pi*r^2 *h  →

343 =pi*(1.5)^2*h →

343 / [pi *(1.5)^2] = h =  about 48.52cm

CPhill  Oct 20, 2014

### 10 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details