19even better than mine ! hats off to you ! [1]
these days i am seeing a lot of sums being solved by a rather new concept negative mass can anyone expln to me its basic theory and its working and applications and if possible any buk over it
-
UP 0 DOWN 0 1 13
13 Answers
19principle of superposition.......thats the only issue in this concept !
suppose you want to find the gravitational field intensityl at a point due to a figure that has some mass removed from it(i.e. a cavity) ...what you do is imagine that the entire mass is there and then place a mass with a negative sign in the place of the cavity ! then you get exactly the same thing as the given figure ! find the grav field intensity at the point due to the entire mass and the negative mass separately,,,add them up , vectorially, and get the answer !
62Good explanation by debotosh..
to add to it.. i mean an example.. read this one..
[url=http://targetiit.com/iit-jee-forum/posts/center-of-mass-of-the-cut-disc-from-an-original-on-80.html]Center of mass of a removed mass system[/url]
1wat is the moment of inertia of a circular arc placed L distance from a fixed axis.mass of arc is m.
62What is the orientation of the arc..
can you be slightly more precise.. cos the answer could vary a lot depending on the orientation!
19aree give the complete information, we require the angle subtended by the arc at the centre of the circle !!!!
1oh so its jsut whats there in dc pandey a more fancy name i had already studied t
62It is simply mL2
because eeach element of the arc is at a distance of r from the axis
so the total moment of inertia is ∫dm.L2 which is simply mL2