Determine the magnitude of the moments of the force F
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- čas přidán 31. 10. 2016
- Determine the magnitude of the moments of the
force F about the x, y, and z axes. Solve the problem (a) using
a Cartesian vector approach and (b) using a scalar approach.
Determine the moment of this force F about an axis
extending between A and C. Express the result as a Cartesian
vector. Get the book: amzn.to/2h3hcFq
Your every video really helps me so much
OMG you're a life saver bro! Thank you
Thanks a lot. spent a lot of time working on this one... I had gotten right to the end but for whatever reason the result of my dot product was a vector and not a scalar... sometimes it's the basics that throw us off :)
for the right hand rule for Mz why is the +x and -y i keep get +x and +y or -x and -y are we point the z finger up or down
how do you find the unit vectors for Ux, Uy, and Uz?
unit vector in x axis, y axis, and z axis.
Thanks
Best help ever!!!
Can someone explain the right hand rule stuff he uses to determine positive or negative for the moments
point your fingers starting at y then go to z your thumb should be pointing out at you which means positive x
how did you get the unit vector to be 1 , 0 , 0 ? im confused
thomas r I believe he is not answering question 2 he is just re answering question one with a different technique. Threw me for a loop too.
Where you get the 1 as unit vector drom
X-axis
problem 4-71. Two couples act on the beam. I need help!
Hello, I have a question. For the moment about AC axis, can i use the position vector CB instead of AB?? And will the answer be the same?? Thank you👍
yes u can
@@milkman5894 but the answer would not be the same, I used CB before watching this video
In scaler approach im confused i think u did wrong in Mx when u did 12×-2 =24 . How it can be 24 if theres no negative sign with 12.
its is negative correct, but your doing negative matrices so the sign flips.
thank you
How did you find the top row f the matrix (1,0,0)?
unit vector in x axis
Essentially meaning that when he's looking for the moment x, "1" will represent the x axis and the "0"s will represent the y and z axis. So if he's looking for the y, it would be (0, 1, 0)
Keep up the good work
Why can't you use r = CB to greatly simplify the calculation? The arm extends from the axis to the force vector so I don't see why it shouldn't work.
Jeremy Kinnear It can work, I think he just wanted show it from the origin
It works , and it is much easier
If we take r=CB the answer is13.376. The two answers are a little different.
@AC wait really how? Cause rCB is 0i + 0j -2k right? And when I do the crops product I get some different numbers
good but not clear
Goat
you did the moment for y axis wrong. its -4. shit is sorry
the real answer for scalar is 15i + 4j + 36k
I'm having to much trouble because of hand writing
I feel like 70% of the people that do these help videos don't know how to write...
@@Shardus_Blunder maybe you're just not used to the notations and symbols he uses.... you'll be more familiar with more exposure!
its AC not AB