Laws of Motion-17

JEE Main 2015 Questions › Mechanics questions › Laws of Motion-17

#Physics #Mechanics

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7 Answers

213

Nandikesh Singh ·2013-07-08 05:07:43

Block B will never reach the pulley.

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Akash Anand Wrong guess..keep trying
Upvote·0· Reply ·2013-07-08 06:03:40
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1133

Sourish Ghosh ·2013-07-09 10:18:22

1√2 sec

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Akash Anand Wrong answer..keep trying
Upvote·0· Reply ·2013-07-09 22:12:40
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996

Swarna Kamal Dhyawala ·2013-07-11 22:09:00

0.14 sec

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Akash Anand Wrong answer..keep trying
Upvote·0· Reply ·2013-07-11 22:40:44
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1161

Akash Anand ·2013-07-11 22:42:26

The correct answer is 0.5 sec

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Swarna Kamal Dhyawala ·2013-07-11 23:21:51

For Block B,
T=F₂
For Block A,
F₁-2F₂= ma
from here acceleration = 4m/s²
s=12at²
t=0.5 sec

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Akash Anand Good work But one thing I am not able to understand, why you always need an answer for solving a question? You should answer it without knowing the answer. It's kind of justifying it, not soling.
Upvote·0· Reply ·2013-07-12 03:38:02
Anindita Roy how is acceleration of block a be equal to that of b ? a and b are being pulled by different forces ...
Upvote·0· Reply ·2013-07-12 09:54:41
Swarna Kamal Dhyawala sorry sir previously i did some mistake ,next time i will try my best
Upvote·0· Reply ·2013-07-12 09:58:58
Swarna Kamal Dhyawala @anindita -for block A F1-2T= ma (as T=F2)
Upvote·0· Reply ·2013-07-12 10:01:43
Anindita Roy THAT a is acceleration of block A how can it be the acceleration of block B ?
Upvote·0· Reply ·2013-07-12 10:23:17
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1133

Sourish Ghosh ·2013-07-12 10:26:25

You have to apply pseudo force on B,
eqn will be,
F2 - ma = ma',
a' is acceleration of B.

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Akash Anand @Sourish.. Do we need to apply pseudo force here??
Upvote·0· Reply ·2013-07-14 23:03:49
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1161

Akash Anand ·2013-07-14 23:22:36

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