Blue...


Somebody made a giant spherical cavity in the earth such that the earth's center and a point in the surface are diametrically opposite.

The someone drops a small ball from a small opening at the surface into the cavity. In how many minutes does the ball reach the center of earth???

16 comments:

  1. ChaitanyaApril 5, 2010 at 9:20 PM

    acc ke do expression to aa gaye but integrate nahi ho pa raha

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  2. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○April 6, 2010 at 3:01 PM

    This comment has been removed by the author.

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  3. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○April 6, 2010 at 7:12 PM

    is the answer is 26.87 minutes.

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  4. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○April 6, 2010 at 8:04 PM

    This comment has been removed by the author.

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  5. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○April 6, 2010 at 8:06 PM

    PLEASE VISIT IN THE FOLLOWING LINK TO SEE MY DOUBT http://www.goiit.com/posts/list/magnetism-please-solve-this-mutimatching-problem-1014340.htm

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  6. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○April 6, 2010 at 8:10 PM

    i have only one conceptual doubt.It is a multimatching problem.only tell in column 2 option (s) matches with what options in column 1 and why?please give detail reasoning please.dont give shortcut reasoning please sir HELP ME!!!!

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  7. Sambhav GuptaApril 6, 2010 at 8:47 PM

    yr tune yeh link daalkar iss question ka saara essence khatam kar dia...

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  8. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○April 6, 2010 at 8:50 PM

    I CANT MAKE DIAGRAM IN THIS BLOG.SO SAMBHAV DONT FEEL BAD ABOUT ME PLEASE.I HAVE NO OTHER OPTION

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  9. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○April 6, 2010 at 9:04 PM

    I USE Re = 6.378x10^6 m and g = 9.81 m/s^2

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  10. AnujApril 7, 2010 at 8:38 PM

    someone else with a soln????

    anybody with any idea of the nature of field in the cavity??

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  11. Sambhav GuptaApril 7, 2010 at 11:04 PM

    field in a hollow sphere is uniform..?

    dunno anything about this....gravitational was left out...they told us that it would be covered in electrostatics

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  12. AnujApril 8, 2010 at 1:11 AM

    damn...

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  13. ChaitanyaApril 8, 2010 at 8:57 PM

    use the formula for acc (GM/R^2)*x/R for the 2 spheres and subt. then integrate and t1,t2

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  14. Sambhav GuptaApril 8, 2010 at 9:30 PM

    would the ball be ever able to reach the center of earth 'on its own' ?

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  15. AnujApril 9, 2010 at 4:15 PM

    maybe you people will get to know this later...

    but the field in a cavity in a uniform sphere is same as that at the centre of the cavity had there been no cavity.

    here, the field is that at R/2 when there was no cavity..which is equal to g/2...(remember that graph of g v/s r..its linear remember...)

    and sambhav..i guess it will...this ain't my question, so most probably its correct.

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  16. Mridul GuptaMay 21, 2010 at 10:12 PM

    BHAIYA

    PLEASE TELL HOW TO SOLVE THIS QUESTION

    ReplyDelete

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