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![[Post New]](/templates/default/images/icon_minipost_new.gif) 16 Feb 2008 21:47:48 IST
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do we have to mail the solutions as well
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16 Feb 2008 21:49:06 IST
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Please give the complete soln to Q7
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"I a universe of atoms.......an atom in the universe" |
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16 Feb 2008 21:51:41 IST
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i know that how you have gone about that question and had realised it the instant the options were given but have a look at question
4.177
of irodov everyone its not about saying to everyone that i have done some questions of irodov but i think there is genuinely something wrong in ans 7 pls everybody look there
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Impossible To be Impossible is Impossible |
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16 Feb 2008 21:51:51 IST
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Tie Breaker for ELASTIBOYSAI and THE SNIPER:
The person who solves this question to the maximum extent (Please show the working when you send the mail) will be given 6 salutes and will be declared the official topper of this test, and the other guy 5 salutes.
A uniform rod falls without any rotation onto a smooth horizontal plane. Find the angle that the rod has to make with the horizontal, so that its angular velocity after striking the table is maximum. Assume the collision between the rod and the surface to be perfectly elastic.
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Will nip in at times to solve problems :)
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16 Feb 2008 21:53:52 IST
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@anchit saini:
This is how you go about qn 7:
See, the velocity of sound is quite large as compared to the velocity of the source at that instant (which is only 40m/s). Hence, you can take the speed of the source at t=4s, and proceed with doppler shift, as the sound waves require negligible time to reach the observer.
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Will nip in at times to solve problems :)
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16 Feb 2008 21:54:13 IST
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can i send u the answer tommorow , i have to go now
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" The difficult we do immediately, impossible takes a little longer "
--- U.S. Army
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not have it."
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16 Feb 2008 21:55:58 IST
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Yes sure. Distributing the prizes to the winners.....
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16 Feb 2008 21:56:38 IST
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no karthik you have to consider what you did't because with that the answer is coming 894.4... even though the difference is small in your options , the difference is minute hence you should take it into considereation
pls consider my opinion. i am not wrong
do have a look at 4.177 pls
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Impossible To be Impossible is Impossible |
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16 Feb 2008 21:57:49 IST
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let the sound source fall through a distance h in time t. Let it emit a sound at this instant. Time taken by sound to travel back the distance h towards the man = h/320
but h = gt^2/2 = 5t^2
therefore
t + 5t^2 = 4
solving this quadratic in t we get t =3.77 s
Velocity of the source at this instant = gt = 37.7m/s
app frequency = 1000 (320)/{320+37.7}
= 894.6 Hz
So nearest ans is c
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16 Feb 2008 21:58:20 IST
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hey karthik can u plz post the solns so that i can check my answers as i was unable to give the test coz i had my citation today Thanks
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16 Feb 2008 21:58:21 IST
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everyone pls at least consider my opinion as 40m/s is not neglegible to 320m/s
we all know that
do i have no support?
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16 Feb 2008 21:58:44 IST
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I also agree with anchit
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"I a universe of atoms.......an atom in the universe" |
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16 Feb 2008 21:59:02 IST
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anand has done it the way i did
exactly like that
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Impossible To be Impossible is Impossible |
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16 Feb 2008 21:59:41 IST
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You are not wrong in your concept anand, but this is an objective question, so please try to neglect complications as far as possible.
I am not saying that you are wrong in your concept. But I have marked you according to the key given, because in the main paper, you cannot argue if there is an ambiguity like this.
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16 Feb 2008 22:01:31 IST
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