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![[Post New]](/templates/default/images/icon_minipost_new.gif) 2 Aug 2007 22:44:46 IST
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A car is moving with uniform acceleration 2m/s2. A pendulum is hanged in the car. A man is standing out side the car. Find the angle that the pendulum makes with the vertical w.r.t man. Please answer this.
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2 Aug 2007 23:26:56 IST
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Tsin@=ma
Tcos@=mg
So tan@=2/10
@=11.3degrees
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3 Aug 2007 00:09:28 IST
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Perfevt answer nishant
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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3 Aug 2007 11:47:36 IST
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You're correct Nishant!
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4 Aug 2007 09:44:15 IST
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because with the bob of the pendulum the hanged part of the string also move
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4 Aug 2007 10:53:09 IST
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The answer is incorrect.
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4 Aug 2007 13:09:26 IST
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no hes perfectly correct.
acceleration of the car behaves in the same way as if car was stationary and acceleration was provided to the bob of pendulum in opp. direction. this is using concept of pseudoforce.
so let tension of tilted string making angle @ with vertical = T
equating forces on bob, we get
Tcos@ = mg
Tsin@ = ma
divide to solve and we get
tan@ = a / g. substitute values
tan@ = 2/ 9.8
@ = tan inverse (0.204) approx.
PLZ RATE :)
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* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
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4 Aug 2007 14:43:11 IST
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Let mass of car be m.
Then pseudo force on the bob and the tied part of the pendulum is constant
i.e. 2m
Therefore the pendulum makes an angle
of 0 degree with the verticle w.r.t to man.
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4 Aug 2007 15:18:56 IST
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@gouravdhanda man wht r u doing!?!
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* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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4 Aug 2007 15:20:14 IST
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u have to equate all the forces. pseudoforce is constant ok.. how do u get 0 degrees from that?.. angle will be 0 degrees when car is moving with constant velocity..
havent u experienced a backward force when the vehicle ur travelling in is accelerating.. and ur body gets tilted.
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* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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