Thursday

April 17, 2014

April 17, 2014

Posted by **Aaron** on Sunday, February 12, 2012 at 3:30am.

direction cosines of the moment of this force about point A (-4; 5; 6) ft

So in this case wouldn't

vector r= -4i +5j +6k

and

vector F = 7i + 6j - 5k lb?

and r X F = -61i +22j -59k = MA

[MA]= 87.67 ft-lbs

cosα = -61/87.67 => α=134°

cosß= 22/87.67 => ß=75.5°

cosγ= -59/87.67 => γ=132.3°

Not sure exactly where I went wrong because those angles don't make any sense.

- Engineering/Physics -
**drwls**, Sunday, February 12, 2012 at 5:46amIf the force acts at the origin, the lever arm r about point A is the opposite vector,

r = 4i -5j -6k

- Engineering/Physics -
**Aaron**, Sunday, February 12, 2012 at 2:21pmAh, I knew there must be something off about my answer.

Thank you so much!!!

**Related Questions**

Engineering Mechanics - A force of 100 N is acting at a point Resolve this force...

Math (Statistics) - Five college engineering students are choosing specialized ...

food engineeirng - i intend to take the course of food engineering.may i noe tat...

engineering - Determine the resultant force and its inclination with ox

engineering - How has hydraulic engineering altered local and regional ...

engineering - How is bacteria used in genetic engineering?

engineering physics - An object of mass m is dropped at t=0 from the roof of a ...

engineering - Why people need to be engineering

MATH - At McLeod University, thirty percent of the students are in Engineering. ...

mechanical engineering - how much is the net force required to accelerate 1000kg...