Congrats!!




Many people cleared the JEE today..congrats to em all! Further, the blog now boasts of 60 followers..so congrats to me.

Now, this question HAS a history with me..
Particle 'A' is located at (1,2,3), and particle 'B' at (-1,-2,6). A has a constant velocity V1(vector), B has V2(vector).

Find the unit vector in direction of (V2-V1), if A and B are supposed to collide somewhere in the future.

13 comments:

  1. AnujMay 27, 2010 at 11:57 AM

    i've gotten used to seeing this "0 comments"...cmon people..we need an answer here!

    ReplyDelete
  2. ankush sachdevaMay 27, 2010 at 12:57 PM

    wont there be infinite answers to this

    they can collide head on or obliquely
    since there are no restrictions on V1 and V2

    ReplyDelete
  3. KapilMay 27, 2010 at 3:22 PM

    hey anuj,
    could u tell me how the online JEE counselling works ( since u would have filled ur options last year )

    I want to know if we have to provide our preferences for only courses or branches or both
    ( or in case anything else )

    ReplyDelete
  4. akash rupelaMay 27, 2010 at 5:14 PM

    (2i+4j-3k)/root29 ?

    ReplyDelete
  5. AnujMay 28, 2010 at 9:22 AM

    ankush, you're wrong...akash is right.

    hi kapil...i don't really much abt. the online counselling..we had ours in iit delhi.

    ReplyDelete
  6. Sambhav GuptaMay 28, 2010 at 9:04 PM

    someone got to tell me how...

    ReplyDelete
  7. akash rupelaMay 28, 2010 at 9:29 PM

    i feel this is the easiest ques on blog till now
    just draw 2 points on coordinate plane, then draw their velocity vectors
    CATCH THE HINT IN QUES-they collide after sometime
    this becomes ques of simple vector addiction

    will leave the rest to you :)

    ReplyDelete
  8. Sambhav GuptaMay 28, 2010 at 11:12 PM

    ya this one was easy...
    V1 and (-V2) form the two sides of the triangle whose third side is the vector joining the two given points....this vector also represents the required vector sum...

    Thnx yr akash!

    ReplyDelete
  9. AnujMay 30, 2010 at 9:38 AM

    Mr.Rupela is right..but i wanted u to revisit the eqn. of uniform motion in vector form:
    _ _ _
    r(t)=r1+v1*t
    _ _ _
    R(t)=r2+v2*t...
    ,
    for them to collide: R(t)=r(t) for some t=t...

    rest follows..

    ReplyDelete
  10. guntashMay 30, 2010 at 11:39 AM

    good ques....chalo module 3 bhi revise kara diya(almost)

    ReplyDelete
  11. Sambhav GuptaMay 30, 2010 at 12:08 PM

    are we supposed to know abt the 'history'..?

    ReplyDelete
  12. AnujMay 31, 2010 at 7:50 PM

    sorry guys...just not getting enough time to put up something good. Sambhav knows why 3:)

    ReplyDelete
  13. UnknownJune 10, 2010 at 5:54 PM

    ARRe put some q. re

    ReplyDelete

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