Calculating Buoyant Force for a Suspended Cylinder in an Unknown Fluid

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SUMMARY

The buoyant force acting on an aluminum cylinder suspended in an unknown fluid can be calculated using the difference in weight readings from a spring scale. The cylinder weighs 20N in air and 10N in the fluid, indicating a buoyant force of 10N. The relevant equation for buoyant force is Fb = pVg, where p is the fluid density, V is the displaced volume, and g is the acceleration due to gravity (9.8 m/s²). Understanding this concept is essential for solving problems related to buoyancy in fluid mechanics.

PREREQUISITES
  • Understanding of buoyancy principles
  • Familiarity with the equation for buoyant force (Fb = pVg)
  • Basic knowledge of weight and force concepts
  • Grasp of fluid density and its significance in buoyancy calculations
NEXT STEPS
  • Study the derivation of Archimedes' principle
  • Learn how to calculate the density of fluids
  • Explore applications of buoyant force in real-world scenarios
  • Investigate the effects of fluid viscosity on buoyancy
USEFUL FOR

Students studying physics, particularly those focusing on fluid mechanics, as well as educators seeking to clarify buoyancy concepts for their students.

astru025
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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 :)
 
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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?
 
I do not know. Is there an equation I should use for that?
 
Please help this problem is due soon!
 
You have 20 dollars. You spend some so that you have only 10 left. How much did you spend?
 
astru025 said:
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.
 

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