Question

A wooden cylinder pole is 7m high and it's base radius is 10 cm find its weight if the wood weigh 225kg per cubic meter

Answer 1

volume of the cylinder =π$r^{2}$h

h=7m ,r=10cm =0.1m

∴ Volume =22/7*1/10*1/10*7=0.22cubice metre

Since weight of one cubic metre is 225kg/cubic metre

∴  weight of 0.22 cubic metre wood is 225*0.22=49.5kg

Answer 2

$Volume = \pi r^2h$
$Volume = \frac{22}{7} * (0.1)^2 * 7$
$Volume = 0.22 m^3$
Now Weight:
$Weight = 0.22 * 225$
$Weight = 49.5 kg$