Physics : Dual Rotation..........

JEE Advanced Sample Questions › Mechanics questions › Physics : Dual Rotation..........

Ans : B

Ans : B

#Physics #Mechanics

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6 Answers

33

Abhishek Priyam ·2009-03-26 00:39:28

Initially w=v/r

Ei=mv²

finally... w doesnot changes.. but v becomes v/2 (in forward direction and momentum conservation...)

v in upward direction=0(max ht)

so mv²=mgh+1/2m(v/2)²+1/2m(v/2)²+1/2mr²w²
mv²=mgh+1/2m(v/2)²+1/2m(v/2)²+1/2mv² .w=v/r

so h=v²/4g

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21

tapanmast Vora ·2009-03-26 00:41:29

"Ei=mv2" Kyun y not 1/2 mv²

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21

tapanmast Vora ·2009-03-26 00:44:04

or is it due to KE_trans + KE_rot.

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33

Abhishek Priyam ·2009-03-26 00:44:18

Q.112

writing about com

Il/2=ml²/12Ï‰

also I=mv_c

given Ï‰l/2-v_c=v

solving these we get

Ï‰=6I/ml

6I/ml(l/2)-I/m=v

I=mv/2... answer

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33

Abhishek Priyam ·2009-03-26 00:45:07

1/2(mv²)+1/2(mr²)(v/r)²=mv²

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21

tapanmast Vora ·2009-03-26 00:47:15

OH wow!!!

Truely genius!!!

Thanx Buddy [1]

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