• Support PF! Buy your school textbooks, materials and every day products Here!

Need help on a problem

  • Thread starter jrzygrl
  • Start date
16
0
A block with a density of 545 kg/m[tex]^{3}[/tex] and a volume of 0.645 m[tex]^{3}[/tex] is held completely under water by means of a rope. Determine the magnitude of the force of the cord on the block.

Relevant Equations
F[tex]_{}buotant[/tex] = [tex]\rho[/tex][tex]_{}fluid[/tex]V[tex]_{}submerged[/tex]
Unsure about any others...

I had no idea how to even solve or approach this problem. Much thanks appreciated!
 

Answers and Replies

412
2
Draw a free body diagram. There are 3 forces acting on the block: The buoyant force, the gravitational force and the tension in the string.

The gravitational force and the tension are in the same direction, but the buoyant force is in the other. Hence, those two forces must equal the third. Can you solve it now?
 
16
0
thanks i understand the problem now
 

Related Threads for: Need help on a problem

  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
978
  • Last Post
Replies
11
Views
2K
  • Last Post
Replies
6
Views
2K
Replies
7
Views
10K
Replies
4
Views
979
Replies
10
Views
1K
Replies
3
Views
2K
Top