Bouyancy???

[nvestr21]

---

Members don't see this ad.

Okay, does bouyancy change with depth? We know that pressure increases with depth in water but I dont' knwo what to think about bouyancy. I have in my undergrad notes that it is one thing but EK says that it does not change with depth. Anyone have any clarification for me? hopefully....

 

[DHMO]

Okay, does bouyancy change with depth? We know that pressure increases with depth in water but I dont' knwo what to think about bouyancy. I have in my undergrad notes that it is one thing but EK says that it does not change with depth. Anyone have any clarification for me? hopefully....

I don't think bouyancy will change with depth. A caveat to that is that as depth increases, the density of the liquid will slightly increase, which will slightly increase the bouyant force--but something like that won't show up on the MCAT.

 

[BaylorGuy]

Last time I remembered this was the equation for bouyancy force

Bouyancy Force=rho(density of liquid)*g(gravity)*V(volume displaced)

Thus, there should be no difference in the bouyancy force...however there is a difference in the pressure. Pressure=rho(density)*g(gravity*h(depth under the water). The larger the depth, the larger the pressure

 

[cfdavid]

No, buoyancy will not increase with depth. Considering a totally submerged object, the buoyant force pushes up, and the weight of the object pushes down.

Ofcourse, pressure increases with depth, but at any given depth, the difference in pressure above the object and below the object will remain the same.

Remember that for a floating object, the buoyant force is equal to the objects weight. So, the floating object displaces a volume of water that is equal to the weight of the object.

But for submerged objects, the buoyant force is equal to the weight of the volume of water displaced (i.e. the volume of the object).

 

[musiclink213]

Kind of along the same token, I remember a similar problem on one of my practice exams, and it was something like an object completely submerged at equilibrium in water, and then if you push it down to a deeper depth, what happens to the object? I wish i could remember where it was from, but i've taken so many practice exams i can't keep track anymore.

 

[Daichi Katase]

Kind of along the same token, I remember a similar problem on one of my practice exams, and it was something like an object completely submerged at equilibrium in water, and then if you push it down to a deeper depth, what happens to the object? I wish i could remember where it was from, but i've taken so many practice exams i can't keep track anymore.

If the density of water doesn't change, then it should remain in equilibrium?

Because weight is the same and the bouyant force is also the same.