Weight is the force that an object exerts on its surroundings. To find weight, we look to Newton's law, and find that force = mass * acceleration, or F = ma. To find the weight of a stationary, cylindrical piece of Oregon pine on the earth's surface, we need to know its mass and the acceleration of gravity, which is 9.8m/s^2. We can now see that F = ma is equivalent to weight = mass * gravity, or W = mg.
Find the density of the material; according to Engineering Tool Box, the density of Oregon pine is 530 Kg/m^3.
Find the volume of the wood by multiplying pi * radius^2 * height. The radius and the height should be in meters.
Multiply the volume by the density to get the mass of the object.
Multiply the mass of the object by the acceleration of gravity to find the weight of the object.
Take exact measurements to ensure that your calculations of the weight are accurate.