# Recent content by tennisgirl92

1. ### Buoyant Force

Got it! THANK you! You have been so helpful
2. ### Buoyant Force

I know Volume would equal .09x.09xh, but wouldn't this height be referring to be side of the 1.3m? aren't we looking for the part of the .09 that is submerged? the post seems to be laying horizontally in the water, not straight up. Also, when I reduce and isolate the height, I obtain .531m or...
3. ### Buoyant Force

So setting it equal... 1029 x Vdw x 9.8=420 x (.09 x .09 x 1.3) x 9.8 Vdw=.0043 m3 How do we find the height from this? Do we subtract it from the volume of the post?
4. ### Buoyant Force

Fb=densityw x Volumedw x g =1029 x Vdw x 9.8 would we set this equal to the density of the post x Volume of post x g?
5. ### Buoyant Force

Ok, it can either be densitywaterx Volumepost x g=masspostxg or densitywaterx Volumepost x g=densitypost x Volumewater x g does this look right?
6. ### Buoyant Force

I believe the buoyant force is equal to the gravitational force, as the object is at rest.
7. ### Buoyant Force

Greater than the gravitational force or m x g. But on the table. the force acting on the post is equal to that of the post acting on the table. In other words, the gravitational force is equal to the normal force. Am I wrong to say that the buoyant force must be greater than the gravitational...
8. ### Buoyant Force

If the post is floating, wouldn't the buoyant force have to be greater? Would we use the density of the wood on the water to find it instead of the density of the water?
9. ### Buoyant Force

ha! oh yes-I did mean water. Sorry. Ok, no the wood is not entirely submerged. But the problem does not given us the percent it is submerged-how do we find that?
10. ### Buoyant Force

Ok, Archimedes's principle states that the magnitude of the buoyant force=weight of the fluid displaced by object Fb=density of fluid x volume of object submerged x g =1029 x (.09 x .09 x 1.3) x 9.8 =106.187 N I don't see where to go next.
11. ### Buoyant Force

Homework Statement A 9 cm square wooden post (density=420kg/m3) is 1.3m long and floats in sweater (density=1029 kg/m3. How deep is the post submerged in the water? The picture shows a 9cm x 9cm cross section of the post. Homework Equations Fb=density of liquid x volume of liquid submerged x...
12. ### Absolute Pressure

The tuna's density must be the same as the surrounding water. Would we do this: absolute pressure of water=density of water x gravity x depth and solve for density of water? we could then equate density=m/v and we have the mass of the fish. 2.44atm=density x 9.8 x 15m density=.01698...
13. ### Absolute Pressure

Since we are given the pressure at the depth, is it redundant to include it in the equation? ok, I see what you mean about water not changing density with depth. But how do we solve for the fish volume without dealing with the tuna's density?
14. ### Absolute Pressure

I guess I do not understand the equation well. In P=pgh, density would be referring to that of the object, Pressure would be referring to that of the incompressible fluid, and h the height of the column of fluid above location. This is what I have in my notes. If we multiply the tuna's density...
15. ### Absolute Pressure

Ok, I think that would mean the body would have the same density as the fluid. But why does the above mean the tuna is reaching all the way to the surface? Are we calling where the tuna is as h=0?