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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Mar 2008 18:21:45 IST
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select the correct option
(a)a single external force acting on a particle necessarily changes its momentum and ke
(b)a single external force acting on a particle necessarily changes its momentum
(c)Work-energy theorem is valid for types of forces internal,external,conservative,non-conservative
(d)ke of a system can be increased without applying e3xternal force on the system
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30 Mar 2008 18:27:28 IST
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b)
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30 Mar 2008 18:28:40 IST
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it is multiple choice
are u sure
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30 Mar 2008 18:31:11 IST
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is the answer is option A
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30 Mar 2008 18:32:51 IST
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I think it is (b) and (d).
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"Nenenthedhavano naake teleedu"
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30 Mar 2008 18:43:18 IST
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Can u plz provide an example for option d?
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" Always remember money isn't everything but make sure you have made a lot of it before talking such nonsense!"
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30 Mar 2008 18:47:44 IST
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K.E CANNOT BE CHANGED WITHOUT GIVING ANY EXTERNAL FORCE. BECAUSE VELOCITY CANNOT CHANGE WITHOUT A FORCE. HENCE D IS WRONG. PROVIDING AN EXTERNAL FORCE CHANGES ITS VELOCITY AND SO K.E AND MOMENTUM BOTH NECESSARY CHANGES. A IS CORRECT. PLZ CORRECT ME IF I AM WRONG. I AM JUST TYPING WHAT IS IN MY MIND.
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30 Mar 2008 18:53:03 IST
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b & c
it cannot be a
for e.g. in uniform circular motion force is acting but change in ke is zero.it cannot be d as if there is chnge in ke there would be some work done acc.to work energy theorem
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30 Mar 2008 18:58:18 IST
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work energy thm is valid in all cases... if force is acting the vel will change,whether in dir or magnitude,but k.e. depends only on d magnitude....... hence b),c)
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