Finding the mass of an object with weight

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To find the mass of an object that cannot be weighed, such as a tree, one can calculate it by multiplying the density of the object's material by its volume. This method allows for an estimation of mass without direct weighing. Understanding the density of the material is crucial for accurate calculations. This approach is particularly useful for art projects exploring unknown forces and hidden values. Utilizing density and volume provides a practical solution for estimating mass in various contexts.
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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
 
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Well, the easiest way would be to multiply the density of the object's material with its volume.
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
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