Finding the mass of an object with weight

[gorm]

Homework Statement

hi, this isn't really a homework question but i guessed this would be a good place to start, my question is how to you find the mass of something you can't weigh? I am an art student and I am doing a project on unknown forces/ hidden values etc and if i wanted to find the weight of say.. a tree? how would i go about doing this?

thanks in advance

 

[radou]

Well, the easiest way would be to multiply the density of the object's material with its volume.