Question

A wooden pole is $7m$ high and $20cm$ in diameter. Find its weight if the wood weight $225kg$ per $m^3$.

Answer 1

Radius $=10$ cm $=0.1$ m
height $=7$ m
volume $= $
$=\frac{22}{7}\times 0.1\times 0.1\times 7$
$=0.22$ meter cube

Density $=225$ kg/meter cube
$225=\frac{mass}{0.22}$
mass $=225\times 0.22=49.5$ kg.