Author Topic: STUCK. (Read 864 times) Tweet Share

fredrick · « **on:** June 06, 2008, 03:30:39 pm »

im stuck on this question, i keep getting Fx=441N how is that possible if Fx and Fy add to 30x9.8??
[IMG]http://img78.imageshack.us/img78/2499/physwz6.jpg[/img]
[IMG]http://img78.imageshack.us/img78/2499/physwz6.dbee42936c.jpg[/img]

cosec(x) · « **Reply #1 on:** June 06, 2008, 04:07:26 pm »

This occurs because you are dealing with torques. The best method is to equate torques about about pivot Y, so

$0.6*300=0.4*F_x$
Thus, $F_x=450N$
Now $F_y+F_x=300N$
Thus $F_y=-150N$

$F_y$ is negative as the slab is trying to pull the column out of the ground, Force Y acts to pull it into the ground and must therefore be acting down

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Author Topic: STUCK. (Read 864 times) Tweet Share

fredrick

STUCK.

cosec(x)

Re: STUCK.

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