7 the density of the american white oak tree is 752 kilograms per cubic meter. if the trunk of an american white oak tree has a circumference of 4.5 meters and the height of the trunk is 8 meters, what is the approximate number of kilograms of the trunk?

First, we determine the volume of the trunk by finding first the radius from the circumference through the equation,

C = 2πr

r = C/2π

Substituting the known values,

r = 4.5/2π = 0.716 m

Then, we calculate for the volume through the equation,

V = πr2h

V = π (0.716 m) 2 (8m) = 12.9 m3

Multiplying the calculated value to the density will give the mass as,

Mass = (12.9 m3) (752 kg/m3) = 9699.36 kg