Question

Given a 10 foot length of tree trunk with a radius of 3 feet, what is the weight of the tree trunk section if it has a density of 45 lb/ft3? (to the nearest whole integer)

Answer 1

You will use the formula for the mass of a cylinder. Since the trunk forms like a cylinder.

It is Mcylinder = density x pi x radius x height

So the given in our problem is:

Density = 45 lb/ft^3

Radius = 3ft

Height = 10 ft

 

Plugging that in our equation:

M cylinder = 45 lb/ft^3 * pi * 3ft^2 * 10 ft

= 5771.26 kgs