More tension prolbmes

  • Thread starter tnhoots
  • Start date
  • #1
36
0
More tension prolbmes!!!

Homework Statement



A 4.95 kg object is attached to a vertical rod by two strings. The object rotates in a horizontal circle at constant speed 7.25 m/s. the lenght of both strings is 2.00m and the lenght of the verticle rod is 3.00m.

(a) Find the tension in the upper string.
N
(b) Find the tension in the lower string.
N



Homework Equations



equation for radius: r^2=c^2 - b^2

The Attempt at a Solution



radius equals 1.32m
 

Answers and Replies

  • #2
JK423
Gold Member
394
7
If i could have a picture of the set or something..
 
  • #3
36
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I could not copy and past the pic...it wouldn't let me paste it on here. It's pretty much a verticle rod with a string coming from the top and the bottom corners to form a triangle. That's the best way I know how to depict it. Sorry
 
  • #4
danago
Gold Member
1,122
4
I could not copy and past the pic...it wouldn't let me paste it on here. It's pretty much a verticle rod with a string coming from the top and the bottom corners to form a triangle. That's the best way I know how to depict it. Sorry
You can upload the image by going to http://imageshack.us, and clicking "Browse". Then just locate the image on your hard drive and press upload. Use the link you are given to show the picture.
 
  • #6
36
0
Hope this helps us all out...I know I need it!
 
  • #7
312
0
What is the centripetal force?
 
  • #8
36
0
the cent. acceleration is v^2/r. Which is 19.6^2/10=38.416
 
  • #9
Pyrrhus
Homework Helper
2,178
1
The problem is pretty straight forward. The acceleration only has one component which is the radial one, so the speed is constant. Use trigonometry to find the radius and to set the component of the tension in the direction of the radial acceleration.
 

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