Second year physics homework, thought I was capable and now am simply frustrated

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SUMMARY

The discussion centers on solving a physics homework problem involving the calculation of the moment (torque) of a force about a specific point, labeled O. The formula for the moment is defined as \(\vec{M}_0 = \vec{r} \times \vec{F}\), where \(\vec{r}\) is the position vector from point O to the line of action of the force \(\vec{F}\). Participants emphasize the importance of constructing the vectors \(\vec{r}\) and \(\vec{F}\) based on the provided geometry in the problem statement. The discussion highlights the challenge faced by individuals with a background in engineering when tackling physics problems.

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AloneWeSink
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So I told my sister I could help her with her physics homework, having an old computer engineering degree, and this first problem she sends me has me stumped. If anyone is willing to help this busy and forgetful young man help his sister I would be immensely appreciative. Thank you in advance.

1. Homework Statement [/b]
Hibbler.ch4.p42.jpg

Determine the Moment of this force about point O.
 
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AloneWeSink said:
So I told my sister I could help her with her physics homework, having an old computer engineering degree, and this first problem she sends me has me stumped. If anyone is willing to help this busy and forgetful young man help his sister I would be immensely appreciative. Thank you in advance.

1. Homework Statement [/b]
[ IMG] http://session.masteringengineering.com/problemAsset/1529323/3/Hibbler.ch4.p42.jpg[/PLAIN]
Determine the Moment of this force about point O.
The Moment of F about point O is the same thing as the torque that force F exerts about point O.

It's given by [itex]\displaystyle \ \ \vec{M}_0=\vec{r}\times\vec{F}\,, \[/itex] where [itex]\ \vec{r}\[/itex] is a position vector from point O to the line of action of force [itex]\ \vec{F}\ .[/itex] For example you could take r to be [itex]\ \vec{r}=\vec{OA}\ .[/itex]

You will need to construct [itex]\ \vec{r}\[/itex] and [itex]\ \vec{F}\[/itex] from the geometry of the situation as shown in the figure.
 

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