raffle_snaffle
  • raffle_snaffle
A wrench 30cm long lies along the positive y-axis and grips a bolt at the origin. A force is applied in the direction <0,3,-4> at the end of the wrench. Find the magnitude of the force needed to supply 100 N m of torque to the bolt.
Calculus1
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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raffle_snaffle
  • raffle_snaffle
|dw:1377573549277:dw|
Zale101
  • Zale101
D: i'll try to help lol
raffle_snaffle
  • raffle_snaffle
So we apply the dot product, right?

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Zale101
  • Zale101
are u familiar with this formula \[t=r*F*\sin(a)\]
raffle_snaffle
  • raffle_snaffle
well the angle is 90"
raffle_snaffle
  • raffle_snaffle
which is 1, right?
raffle_snaffle
  • raffle_snaffle
|dw:1377665738994:dw|
raffle_snaffle
  • raffle_snaffle
Do we use this angle?|dw:1377665798681:dw|
raffle_snaffle
  • raffle_snaffle
Yes Zale I am familiar with the torque forumula
Zale101
  • Zale101
use this formula τ = r x F to split up the cross product since the f is not presented yet. after that, use the other formula | τ | = | r | | F | sin x
raffle_snaffle
  • raffle_snaffle
so using the cross product fisrt? Why? r is a scalar
raffle_snaffle
  • raffle_snaffle
I see where you are going with this now, but I still don;t understand why you would use cross product rxF
Zale101
  • Zale101
Wretch = <0,30,0> cm = <0,0.3,0>m |dw:1377666031668:dw|
Zale101
  • Zale101
@robtobey
raffle_snaffle
  • raffle_snaffle
you solved for F when using t=rxF?
Zale101
  • Zale101
no, i haven't done yer
raffle_snaffle
  • raffle_snaffle
lets stop
raffle_snaffle
  • raffle_snaffle
I will think about it. I think i can solve it now
Zale101
  • Zale101
you can also do it this way too F = τ / ( r * sin x) since force is applied in the [ 0 3 -4 ] direction
Zale101
  • Zale101
u can find x with that
Zale101
  • Zale101
oh great
raffle_snaffle
  • raffle_snaffle
thanks=)
Zale101
  • Zale101
no problem, i often struggle in calculus a lot, but this question was a good exercise :P

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