3d moments problem
Hi friends. I have a problem with this question:
(black line = positive x-axis, grey = positive y-axis, z = positive z-axis)
This is what I did:
cd = 0.4j - 0.2k
|cd| = 0.447
F(ab) = 0.2i + 0.4j - 0.2k
|ab| = 0.489
F(cd) = F(ab) .n(cd)
F(cd) = (F (0.2i + 0.4j - 0.2k) / 0.489) . ((0.4j - 0.2k) / 0.447)
F(cd) = F (0.146j - 0.0365k)
M = r x F
Applying the cross product I get:
F (0.0438i) = 50
Then I have no idea what to do. Is this even wrong, and if so what am I doing wrong?
(black line = positive x-axis, grey = positive y-axis, z = positive z-axis)
This is what I did:
cd = 0.4j - 0.2k
|cd| = 0.447
F(ab) = 0.2i + 0.4j - 0.2k
|ab| = 0.489
F(cd) = F(ab) .n(cd)
F(cd) = (F (0.2i + 0.4j - 0.2k) / 0.489) . ((0.4j - 0.2k) / 0.447)
F(cd) = F (0.146j - 0.0365k)
M = r x F
Applying the cross product I get:
F (0.0438i) = 50
Then I have no idea what to do. Is this even wrong, and if so what am I doing wrong?
Hi there,
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While you're waiting for an answer, did you know we have 300,000 study resources that could answer your question in TSR's Learn together section?
We have everything from Teacher Marked Essays to Mindmaps and Quizzes to help you with your work. Take a look around.
If you're stuck on how to get started, try creating some resources. It's free to do and can help breakdown tough topics into manageable chunks. Get creating now.
Thanks!
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Original post by leosco1995
Hi friends. I have a problem with this question:
(black line = positive x-axis, grey = positive y-axis, z = positive z-axis)
This is what I did:
cd = 0.4j - 0.2k
|cd| = 0.447
F(ab) = 0.2i + 0.4j - 0.2k
|ab| = 0.489
F(cd) = F(ab) .n(cd)
F(cd) = (F (0.2i + 0.4j - 0.2k) / 0.489) . ((0.4j - 0.2k) / 0.447)
F(cd) = F (0.146j - 0.0365k)
M = r x F
Applying the cross product I get:
F (0.0438i) = 50
Then I have no idea what to do. Is this even wrong, and if so what am I doing wrong?
(black line = positive x-axis, grey = positive y-axis, z = positive z-axis)
This is what I did:
cd = 0.4j - 0.2k
|cd| = 0.447
F(ab) = 0.2i + 0.4j - 0.2k
|ab| = 0.489
F(cd) = F(ab) .n(cd)
F(cd) = (F (0.2i + 0.4j - 0.2k) / 0.489) . ((0.4j - 0.2k) / 0.447)
F(cd) = F (0.146j - 0.0365k)
M = r x F
Applying the cross product I get:
F (0.0438i) = 50
Then I have no idea what to do. Is this even wrong, and if so what am I doing wrong?
I give up, I've been at this through the weekend and I'm not sure if what I was doing was right
Managed to solve it yet? :L
I tried using the shortest distance between the 2 lines to find the lever arm and being at 90 degrees so then once I found the component I then tried to get the angle to the force direction, but to no avail :L
(edited 10 years ago)
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