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![[Post New]](/templates/default/images/icon_minipost_new.gif) 16 Feb 2008 22:19:46 IST
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i am not asking for marks its just that whats right and whats not
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Impossible To be Impossible is Impossible |
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16 Feb 2008 22:49:52 IST
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ya nice test thnx....... hhrhrhrhhhhhhhhhhhhrrrrrrrrrrrrrrrrrrrrrrrrrr!!!!!!!!!
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16 Feb 2008 23:07:50 IST
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Thanx Karthik for a nice test.
Keep posting such tests in future also.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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16 Feb 2008 23:12:31 IST
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Congrats to the winners. They did extremely well.
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Will nip in at times to solve problems :)
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16 Feb 2008 23:28:55 IST
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karthik u have organised a wonderful test thanx a lot.........
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" The difficult we do immediately, impossible takes a little longer "
--- U.S. Army
"It's better to have a gun and not need it than to need a gun and
not have it."
--- The Sniper
"You can get more with a kind word and a gun than you can with a
kind word. "
--- The Sniper
"Join the Army: travel to exotic distant lands; meet exciting,
unusual people and kill them. "
--- The Sniper
"The victor will never be asked if he told the truth."
--- Adolf Hitler
"Stop talking, start doing"
--- IBM
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16 Feb 2008 23:33:02 IST
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Detailed solutions will be posted tomorrow morning. So look out for that.
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Will nip in at times to solve problems :)
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16 Feb 2008 23:36:47 IST
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JEE mock tests Physics - 08
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" The difficult we do immediately, impossible takes a little longer "
--- U.S. Army
"It's better to have a gun and not need it than to need a gun and
not have it."
--- The Sniper
"You can get more with a kind word and a gun than you can with a
kind word. "
--- The Sniper
"Join the Army: travel to exotic distant lands; meet exciting,
unusual people and kill them. "
--- The Sniper
"The victor will never be asked if he told the truth."
--- Adolf Hitler
"Stop talking, start doing"
--- IBM
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16 Feb 2008 23:57:51 IST
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Hope all of you enjoyed solving the qns
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Will nip in at times to solve problems :)
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16 Feb 2008 23:59:46 IST
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ya almost enjoyed except the bonus one lol
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" The difficult we do immediately, impossible takes a little longer "
--- U.S. Army
"It's better to have a gun and not need it than to need a gun and
not have it."
--- The Sniper
"You can get more with a kind word and a gun than you can with a
kind word. "
--- The Sniper
"Join the Army: travel to exotic distant lands; meet exciting,
unusual people and kill them. "
--- The Sniper
"The victor will never be asked if he told the truth."
--- Adolf Hitler
"Stop talking, start doing"
--- IBM
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17 Feb 2008 13:01:26 IST
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karthik pls post the soln to the bonus ques plzzz
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"Imagination is more important than knowledge."
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17 Feb 2008 14:44:42 IST
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Hey guys here is my soln to the Bonus problem Suppose the rod is A P B with AP = l/4 , AB = 2l , P is the last point of contact with the table . Now mass of AP = mg/8 , mass of PB = 7/8mg C.M of AP is at a distance of l/8 from P , and C.M. of PB is at a distsnce of 7/8 l from P Now moment of forces around P = (7/8)^2 mgl - (1/8)^2 mgl = 3/4 mgl Now m.i. of the rod about P =1/12 m ( 2l ) ^2 +m ( 3/4l )^2 = 43/48 ml^2 So angular accn =  = 36/43 g/l Linear accn of c.m of the whole rod = 36/43 g/l * 3/4 l = 27/43 g Now applying Newton's second law of motion we get mg - N = 27/43 mg N = 16/43 mg
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17 Feb 2008 14:54:09 IST
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In the actual soln that I sent to Karthik finally I had taken (wrongly) the rod to be of length l ( in the m.i. formula = 1/12 mI^2 + ... instead of 1/12 m ( 2l )^2 + ... ) I spotted the mistake very soon but as I am going to send him my rectified answer , the power went off ................. !!!!!!!!!! Anyway, it is a good qn .
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17 Feb 2008 15:26:40 IST
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cant we do by taking the whole rod and writing torque about P due to mg & N
NL/8 + mg3l/4 = 43/48mL^2 * alpha
then mg - N = m* 3l/4 * alpha
this way i'm gettin N = 32/95mg pls tell me where am i going wrong
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"Imagination is more important than knowledge."
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17 Feb 2008 15:28:18 IST
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Hey , N is acting at the last point of contact and perpendicular to the rod !!
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