The mass of an aluminium rod varies directly with its length. If a 16 cm long rod has a mass of 192 g, find the length of the rod whose mass is 105 g.

Question

Philoid · Accepted Answer

According to the question, the mass(m) of an aluminium rod varies directly with its length(l). Here, we use the direct proportion.

In direct proportion,

∴

⇒ k = 12

If mass of the rod = 105g

Then,

⇒

⇒ cm