Calculating Buoyant Force for a Suspended Cylinder in an Unknown Fluid

[astru025]

Homework Statement

An aluminum cylinder is suspended in an unknown fluid by a spring scale. Outside the fluid, the object weighs 20N. In the fluid, the scale reads 10N. What is the buoyant force on the cylinder?

Homework Equations

Fb= pVg, p= density of fluid, V= displaced volume, g= 9.8 m/s

The Attempt at a Solution

I do not know where to start and any help will be much appreciated! Just need to be pointed in the right direction :)

 

[TSny]

Suppose an object that weighs 20 N is sitting on a scale. You lift up on the object until the scale reads 15 N. How much force are you exerting upward on the object?

 

[astru025]

I do not know. Is there an equation I should use for that?

 

[astru025]

Please help this problem is due soon!

 

[nasu]

You have 20 dollars. You spend some so that you have only 10 left. How much did you spend?

 

[R136a1]

Please help this problem is due soon!

No offense, but then you should have started working on the problem earlier and ask for help earlier. Saying "help now because it's due soon" only irritates helpers, it never makes you get help faster.