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haridas_mandal Group Title

In the given figure all the surfaces are smooth. The ratio of forces exerted by the wedge on the mass M WHEN F is not applied and when the force F is applied such that M is at rest with respect to the wedge is --- Answers options-1,1:2,sec^2 theta,cos^2 theta.

  • one year ago
  • one year ago

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  1. haridas_mandal Group Title
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    |dw:1350498047651:dw|

    • one year ago
  2. Algebraic! Group Title
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    |dw:1350584039429:dw|

    • one year ago
  3. haridas_mandal Group Title
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    could you explain a bit how the FBD is drawn with Normal Reaction as mg/cos theta

    • one year ago
  4. Algebraic! Group Title
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    you mean for case 2?

    • one year ago
  5. Algebraic! Group Title
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    sure... there are only two forces on the block in that case... N and mg... the horizontal component of N must be F and the vertical component must be mg

    • one year ago
  6. haridas_mandal Group Title
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    Oh . yes i have not got the logic clear.

    • one year ago
  7. Algebraic! Group Title
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    ah whoops, I see why you're asking..

    • one year ago
  8. Algebraic! Group Title
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    I labelled the theta incorrectly...

    • one year ago
  9. Algebraic! Group Title
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    |dw:1350585942860:dw|

    • one year ago
  10. Algebraic! Group Title
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    there now it works...:)

    • one year ago
  11. Algebraic! Group Title
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    N2 is mg/cos(theta)

    • one year ago
  12. Algebraic! Group Title
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    |dw:1350586072251:dw|

    • one year ago
  13. haridas_mandal Group Title
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    But what about M at rest ? Is the Normal Reaction force mg/cos theta is sufficient to negate mg sin theta component. I am not so sure whether I have got the concept right. Could you please elaborate. I have got the values right.

    • one year ago
  14. haridas_mandal Group Title
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    After a second thought it struck me that the wedge is pitted against the Mass M and there is as such no component as mg sin theta...am i correct?

    • one year ago
  15. Algebraic! Group Title
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    m is at rest with respect to the ramp when it's accelerating with the ramp...

    • one year ago
  16. Algebraic! Group Title
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    yeah I mean, you could decompose mg into vectors along the ramp or into/out of the ramp, but it would be pretty pointless...

    • one year ago
  17. haridas_mandal Group Title
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    Thanks

    • one year ago
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