Question

wooden cylindrical Pole is 7 metre high and its base radius is 10 centimetre. Find its weight if the wood weigh 225 kg per cubic metre

Answer 1

Here, height h = 7 m

radius (r) = 10 cm = 0.1 m

diameter (d) = 20 cm = 0.2m

apply formula of volume = π r^2 h

= 22/7 * 0.1 * 0.1 * 7

= 0.22 m^3

Weight of 1 cubic meter wood = 225kg/ m^3

That's why

225 * 0.22 = 49.5 kg .

It's our answer.

Hope it's useful.

All the best.

Answer 2

density = mass / volume ,
mass  (kg) = density (kg / cm^3) * volume (cm^3)