Physics Physics Forum

October 21st, 2014, 05:14 PM   #1
Member

Joined: Oct 2014
From: NJ

Posts: 46
Thanks: 2

How do I find my x bar?

I included a picture of the problem I am trying to solve.

force, and specify its location on the beam measured from
point O.

W = 3 kn/m

I got the resultant forces:

(1/2)*3*3 = 4.5 kn
(1/2)*1.5*3 = 2.25 kn

4.5 + 2.25 = 6.75 kn

I know my general equation is:

6.75*xbar = torque

I want to solve for xbar.

xbar should equal 2.5m
Attached Images media_491_49154f9f-447e-4c7d-a571-7c69ff7f2702_php900mg0.jpg (8.7 KB, 1 views)

Last edited by shreddinglicks; October 21st, 2014 at 05:30 PM. October 22nd, 2014, 02:48 AM #2 Senior Member   Joined: Apr 2014 From: Glasgow Posts: 2,166 Thanks: 738 Math Focus: Physics, mathematical modelling, numerical and computational solutions The formula you want is similar to centre of mass: $\displaystyle F\overline{x} = \sum_i F_i x_i$ or $\displaystyle \overline{x} = \frac{1}{F}\sum_i F_i x_i$ So you need to find the sum of the individual forces with their $\displaystyle x$ positions and then divide by the total force. Since you already have the individual forces given to you in the question, you need to evaluate the position each individual force. Can you do this? Thanks from shreddinglicks Tags bar, find Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post mared Trigonometry 3 July 2nd, 2014 09:09 AM kingkos Algebra 5 November 25th, 2012 12:40 AM kevinman Algebra 8 March 8th, 2012 06:53 AM

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