Calculating Buoyant Force for a Suspended Cylinder in an Unknown Fluid

AI Thread Summary
To calculate the buoyant force on the aluminum cylinder suspended in an unknown fluid, the difference in weight readings outside and inside the fluid must be considered. 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's density, V is the displaced volume, and g is the acceleration due to gravity. The discussion highlights the importance of starting homework early and seeking help in a timely manner to avoid last-minute stress. Understanding the basic principles of buoyancy is crucial for solving this problem effectively.
astru025
Messages
163
Reaction score
0

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 :)
 
Physics news on Phys.org
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.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Minimum mass of a block'

Thread 'Minimum mass of a block'

Here we know that if block B is going to move up or just be at the verge of moving up ##Mg \sin \theta ## will act downwards and maximum static friction will act downwards ## \mu Mg \cos \theta ## Now what im confused by is how will we know " how quickly" block B reaches its maximum static friction value without any numbers, the suggested solution says that when block A is at its maximum extension, then block B will start to move up but with a certain set of values couldn't block A reach...
View full post »
Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Figure 1 Overall Structure Diagram Figure 2: Top view of the piston when it is cylindrical A circular opening is created at a height of 5 meters above the water surface. Inside this opening is a sleeve-type piston with a cross-sectional area of 1 square meter. The piston is pulled to the right at a constant speed. The pulling force is（Figure 2）： F = ρshg = 1000 × 1 × 5 × 10 = 50,000 N. Figure 3: Modifying the structure to incorporate a fixed internal piston When I modify the piston...
View full post »

Similar threads

Doubt related to buoyant force and fluid thrust force
Replies
9
Views
2K
Is the buoyant force proportional to the mass?
Replies
10
Views
4K
How many people can be on the raft?
Replies
10
Views
828
Buoyant Force and Archimedes' Principle
Replies
13
Views
3K
The Buoyant Force on a Man: What is the Ratio to His Weight?
Replies
7
Views
4K
Finding a buoyant force on an object
Replies
10
Views
5K
Yes, that makes sense. Thank you for pointing that out.
Replies
8
Views
2K
Calculating the Density and Buoyant Force of a Pear in Water with Added Salt
Replies
4
Views
2K
What Happens to the Buoyant Force on a Beach Ball When Submerged?
Replies
4
Views
4K
Buoyancy of Balls A and B in a Swimming Pool
Replies
10
Views
2K

Hot Threads

Recent Insights

Back
Top