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geerky42

  • 3 years ago

Physics -> Rotation Help Needed! (see attachment)

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  1. geerky42
    • 3 years ago
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  2. shubhamsrg
    • 3 years ago
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    |dw:1360138607944:dw|

  3. geerky42
    • 3 years ago
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    Ok, and?

  4. shubhamsrg
    • 3 years ago
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    where are you stuck ?

  5. shubhamsrg
    • 3 years ago
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    |dw:1360138848396:dw|

  6. geerky42
    • 3 years ago
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    On torque. I don't know how to find torque.

  7. geerky42
    • 3 years ago
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    \(\tau = F_\perp r\) , right?

  8. shubhamsrg
    • 3 years ago
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    mg(3) = I (alpha)

  9. geerky42
    • 3 years ago
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    I don't understand exactly what this formula means.

  10. shubhamsrg
    • 3 years ago
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    I will be around the point where it is pivoted

  11. shubhamsrg
    • 3 years ago
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    See its equivalent to F=ma

  12. shubhamsrg
    • 3 years ago
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    here its torque = I alpha

  13. shubhamsrg
    • 3 years ago
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    Can you calculate moment of inertia about the point where it is pivoted?

  14. geerky42
    • 3 years ago
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    \[I = \dfrac{1}{3}m(6^2)\]Right?

  15. shubhamsrg
    • 3 years ago
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    RIght.

  16. geerky42
    • 3 years ago
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    Ok, just checking. I'm starting to understand a little bit. Thanks.

  17. shubhamsrg
    • 3 years ago
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    So mg(3) = I (alpha) simply calculate alpha

  18. geerky42
    • 3 years ago
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    Yeah, I got it.

  19. shubhamsrg
    • 3 years ago
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    Glad you did.

  20. shubhamsrg
    • 3 years ago
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    Its all pretty similar to linear motion, just write net toruqe = I alpha

  21. geerky42
    • 3 years ago
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    Ok, One more question. How can you find torque in this system?

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  22. geerky42
    • 3 years ago
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    @shubhamsrg

  23. shubhamsrg
    • 3 years ago
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    Sorry for the late reply, was busy somewhere.

  24. shubhamsrg
    • 3 years ago
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    So whats your progress in this ?

  25. geerky42
    • 3 years ago
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    I just need to do the same: find the angular acceleration. I'm not sure what to do with torque. I don't know how to find \(F_\perp\).

  26. shubhamsrg
    • 3 years ago
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    |dw:1360140460045:dw|

  27. geerky42
    • 3 years ago
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    Can you be a little more clarity?

  28. shubhamsrg
    • 3 years ago
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    I remains same, right ?

  29. geerky42
    • 3 years ago
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    Right.

  30. geerky42
    • 3 years ago
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    But torque isn't, right?

  31. shubhamsrg
    • 3 years ago
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    perpendicular distance changes

  32. shubhamsrg
    • 3 years ago
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    |dw:1360140731467:dw|

  33. shubhamsrg
    • 3 years ago
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    x is the new distance. our eqn will be mgx = I alpha

  34. geerky42
    • 3 years ago
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    Ah, thanks!

  35. shubhamsrg
    • 3 years ago
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    hmm.

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