Sands :


Here is a method to determine the coeff. of friction b/w sand particles:

A circle of unit radius is drawn (with chalk) on the ground and sand is sprinkled from a hopper into it..the maximum height of the cone achievable thus is H.

Find the value of dU/dH (U : the coeff. of friction), in terms of H.

9 comments:

  1. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○May 24, 2010 at 9:13 PM

    IS THE ANSWER BHAIYA 1 ????.IS MY ANSWER CORRECT BHAIYA?????

    ReplyDelete
  2. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○May 24, 2010 at 10:04 PM

    WHERE IS MY REPLY???IS MY ANSWER CORRECT WHICH I POSTED???

    ReplyDelete
  3. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○May 24, 2010 at 10:46 PM

    where is my first reply of answer???there exists not a single note of This post has been removed by a blog administrator.

    ReplyDelete
  4. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○May 25, 2010 at 8:34 AM

    PLEASE REPLY YES OR MO,IS THE ANSWER 1 OF THIS PROBLEM BHAIYA????

    ReplyDelete
  5. AnujMay 25, 2010 at 12:50 PM

    yes. the answer is 1.

    ReplyDelete
  6. SHUBHAMMay 25, 2010 at 3:12 PM

    please tell the solution anuj bhaiya. i spent a lot of time but can't solve.

    ReplyDelete
  7. AnujMay 25, 2010 at 4:46 PM

    the sand no longer stays on the cone when the

    angle of the cone with the horizontal exceeds the

    angle of repose b/w sand particle and the surface formed till now.

    this implies: U=Tan(angle of repose)=H.

    so: dU/dH=1;

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  8. UnknownMay 25, 2010 at 6:17 PM

    This comment has been removed by the author.

    ReplyDelete
  9. Sambhav GuptaMay 25, 2010 at 11:16 PM

    shit....was just thinking that way..

    ReplyDelete

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