| Author |
Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Dec 2007 22:26:42 IST
|
|
|
which of the following quantities is zero about the centre of mass of body? A)mass b)moment of mass C)acceleration D)angular acceleration
|
|
|
|
17 Dec 2007 22:29:09 IST
|
|
|
its b) moment of mass
|
The heights which great men reached and kept, Were not attained by sudden flight, They, whilst their companions slept, Were toiling upwards in the night.... |
this reply: 0 points
(with 0 
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
|
|
Hey, if you mean for the centre of mass, i think it is angular acceleration since bodies generally rotate about the centre of mass.
|
GIVE LIFE THE BEST....srini...
DO OR DIE, OR BETTER NEVER TRY!!
I dont want to be the most intelligent among the ten.i pray the other nine RE fools!???!!!!!!
it doesn't matter if you win... whats important to me is i win!!!!!!!! |
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
17 Dec 2007 23:02:45 IST
|
|
|
i think it is C. a body can rotate and hence have ang acc about it COM, but cant translate about COM, so cant have acc about COM. (for rigid bodies of course)
|
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
18 Dec 2007 14:28:14 IST
|
|
|
mass certainly cannot be zero at center of mass by moment of mass, do you mean moment of inertia? well if it means moment of inertia, it can only be zero if the axis of rotation passes through center of mass. thats a very specific case acceleration of center of mass is 0 only for the very specific case if it is at rest EDIT: acceleration ABOUT the center of mass is zero for all rigid bodies! in the case of angular acceleration. angular acceleration is 0 only for the very particular case, if the axis of rotation passes through center of mass for rigid bodies, acceleration about com has to be zero. answer is C
|
Ratings do not necessarily signify that someone is good, or bad. I'm here to learn and help others learn, and a person unlocking the mysteries with the help of my solution, to a nagging problem, means more pleasure to me than ratings can ever make me feel. |
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
18 Dec 2007 15:42:26 IST
|
|
|
^^acceleration of center of mass is 0 only for the very specific case if it is at rest.
it doesnt say acceleration of COM, it says acceleration ABOUT com.
i dont think its possible.
|
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
18 Dec 2007 18:19:43 IST
|
|
|
It should be b)
|
Will nip in at times to solve problems :)
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
20 Dec 2007 22:44:00 IST
|
|
|
It is b
moment of mass is the product of mass and postion vector of mass about CoM...i guess.....not sure bout the definition...
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
21 Dec 2007 21:03:01 IST
|
|
|
yaar i think by moment of mass, he means moment of inertia. why on earth must that be 0 for center of mass? it can be, it need not be.
|
Ratings do not necessarily signify that someone is good, or bad. I'm here to learn and help others learn, and a person unlocking the mysteries with the help of my solution, to a nagging problem, means more pleasure to me than ratings can ever make me feel. |
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
21 Dec 2007 21:29:09 IST
|
|
|
Second moment of mass is moment of inertia, not first moment.
|
Will nip in at times to solve problems :)
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
21 Dec 2007 21:40:51 IST
|
|
|
moment of mass of a body about its centre of mass is zero.
i will explain it to you.
mass moment : it is defined as the product of the mass of the particle and distance of the particle from the point about which mass moment is taken. it is a vector quantity and is directed from the point about which it is taken to the particle.
and always remember that the summition (addition) of mass moment of all the masses of a system about centre of mass is equals to zero.
hope i explained it clearly ..................
|
<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
         
<DIV ALIGN="right">Animated Letters</DIV></TD></TR></TABLE>
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
21 Dec 2007 21:45:05 IST
|
|
|
i have given the correct answer ....
many of the above misunderstanded the quest.
so please follow my answer , i know its correct !!!!!!!!!1
surely , it has to be correct.
|
<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
<DIV ALIGN="right">Animated Letters</DIV></TD></TR></TABLE>
|
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
21 Dec 2007 21:46:00 IST
|
|
|
my dear tka , moment of mass doesn't means moment of inertia ??
where did you learnt this from ???????????????!!!!!!!!!!!!!!!!
|
<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
<DIV ALIGN="right">Animated Letters</DIV></TD></TR></TABLE>
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
21 Dec 2007 21:47:36 IST
|
|
|
ishan is correct.
b
|
it is not important where u stand, but in which direction u are moving |
|
|
Moderation Team
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
