- #1
NasuSama
- 326
- 3
Homework Statement
A rectangular block of wood (M = 316 kg) floats on a calm fresh water lake with [itex]d_{o}[/itex] = 14.1 cm below the water. When a dog steps on the block, the block is pushed downward so that now it floads with d = 17.5 cm beneath the water. Find the mass of the dog.
Homework Equations
I would assume that I would need to use these equations:
[itex]P_{2} = P_{1} + \rho hg[/itex]
[itex]F_{Buoyant} = F_{masses}[/itex]
The Attempt at a Solution
Very hard problem here. I would assume that the approach is to write out this form and find the mass of the dog...
[itex]w_{dog} + w_{box} = \rho_{fluid} v_{box}g[/itex]
Another expressions I thought of are:
[itex]P_{2} = 1.013 * 10^{5} + \rho_{mass} * 14.1 * 10^{-2} * 9.81[/itex]
[itex]P_{3} = 1.013 * 10^{5} + \rho_{mass} * 17.5 * 10^{-2} * 9.81 + \rho_{dog} * 17.5 * 10^{-2} * 9.81[/itex]
Stuck with the problem here. Don't know where to start.