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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 Mar 2008 14:31:42 IST
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question challenge
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lol... |
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24 Mar 2008 14:32:01 IST
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A body is acted upon by a constant force which is always perpendicular to the velocity of the particle. the moyion takes place in 2 dimensions . Then [ more than 1 opt. correct]
A -velocity is constant
B- acceleration is constnt
C- kinetic energy is constant
D- moves in a circular path with fixed centre
E- moves in a circular path with variable centre
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lol... |
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24 Mar 2008 14:46:08 IST
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C D
explanation:
f .V =0 (bold letters represent vectors)
So work done by the forcve is zero.
so speed cannot change.
--kinetic energy is constant
and as long as the force is constant and no work is done by the force,
the centre of circle cannot change
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24 Mar 2008 14:46:26 IST
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C,D
For simplicity we can assume the force to be the magnetic force on a charge.
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"All of us are God's creatures... just some are more creature than others." |
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24 Mar 2008 15:00:04 IST
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C,D
velocity and acceleration wont be constant as they are vectors
and their direction keeps changing continously but magnitude is constant as force is constant
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24 Mar 2008 15:07:37 IST
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ya its a,c,d
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24 Mar 2008 15:09:14 IST
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C,D
velocity and acceleration are vector quantities and there direction will constantly change but there magnitude will be constant.
the center of its circular path has to be constant as long as the force is constant.
p.s. pls rate me
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24 Mar 2008 20:23:35 IST
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C,D @ganesh: U sure a is there too?
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______________________________________________
Siddhant Shah
The trouble with doing something right the first time is that nobody appreciates how difficult it is.
You can't control the wind, but you can adjust your sails.
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24 Mar 2008 20:27:03 IST
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oh i'm sorry
c,d is right
got confused a little bit.........
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