jillholiver Posts: 5, Reputation: 1 New Member #1 Mar 4, 2007, 06:09 PM
Physics-solving center of gravity problems
I am doing extra work in my college physics course to try to get in a groove with parallel forces and center of gravity problems. I am stuck. I have navigated my online membership course, RapidMastery for Physics, and I'm still stuck. Any helpful explanations would be appreciated. The problem is this:
The uniform bar is 5.00m long and swighs 975N. A weight of 255N is attached to one end while a weight of 375N is attached 1.50m from the other end. A. Find the tension in the cable. B. Where should the cable be tied to lift the bar and its weights so that the bar hangs in a horizontal equilibrium position?
I am working in circles and need help.
Thank you.
Jill
 Capuchin Posts: 5,255, Reputation: 656 Uber Member #2 Mar 5, 2007, 12:29 AM
What cable??
 jillholiver Posts: 5, Reputation: 1 New Member #3 Mar 5, 2007, 05:04 AM
The cable is positioned at the 2.00m mark of the cable, labeled in the diagram (sorry!) as F4. The tension of F4 is the "cable".
Jill
 Capuchin Posts: 5,255, Reputation: 656 Uber Member #4 Mar 5, 2007, 05:31 AM
I don't see a diagram, this is the problem. So I'm just going on your description, I will have a look at this in a bit.

Edit: another question, is the cable the pivot point?
 Capuchin Posts: 5,255, Reputation: 656 Uber Member #5 Mar 5, 2007, 08:28 AM
Since this seems to me to be a basic moment calculation, I will give you the three equations you need:

These apply for a stationary pivoted system:

Moment about pivot = Perpendicular Force x Distance from pivot

Clockwise moment = Anticlockwise moment

Downward force = Upward force

This should be enough for you to do it yourself, but if you need help please feel free to ask :)
 jillholiver Posts: 5, Reputation: 1 New Member #6 Mar 5, 2007, 02:13 PM
The cable is not the pivot point. The pp is set at the right end of the 5.0 meter bar.
Jill
 jillholiver Posts: 5, Reputation: 1 New Member #7 Mar 5, 2007, 02:14 PM
Thank you, capuchin.
Jill
 Capuchin Posts: 5,255, Reputation: 656 Uber Member #8 Mar 5, 2007, 02:21 PM
How are you doing with it? A picture would be useful :)
 jillholiver Posts: 5, Reputation: 1 New Member #9 Mar 5, 2007, 02:26 PM
I'm on my way back to class. I'll work on it tomorrow and update you then.
Thanks so much.
Jill
 Capuchin Posts: 5,255, Reputation: 656 Uber Member #10 Mar 5, 2007, 02:31 PM
Okay :)
 turin Posts: 2, Reputation: 1 New Member #11 Jan 25, 2013, 05:55 AM
How can I find the center of gravity

 Question Tools Search this Question Search this Question: Advanced Search

## Check out some similar questions!

Hello All, I love Physics and enjoy to help students with different problems. I Am Associate Professor, Ph.D. in Physics and Mathematics, Senior Lecturer in General Physics with more than 20 years experience I. More Details about my subjects and background you can see on my site: ...