IIT JEE , AIEEE Forum - Physics , Mechanics

prakhar_galaxy

Sir we know dat center of mass of a body is found by:

X_com=(_{[i=1 ]}^[n ]m_ix_i) / ( _{[i=1 ]}^{[ n]}m_i)

Y_com=(_{[i=1 ]}^[n ]m_iy_i) / ( _{[i=1 ]}^{[ n]}m_i)

Z_com=(_{[i=1 ]}^[n ]m_iz_i) / ( _{[i=1 ]}^{[ n]}m_i)

I want to know how this result comes means how can we conclude that com of any system is that only

Plz explain it to me in detail i am in gr8 trouble

deepak_agarwal

hey prakhar its really nice to see u asking question but i dint understand y r u in so much trouble just becoz u dont noe where did we get this formulae..well its nt in jee syllabus and wont be asked...to give u in short wht is used is basic definition of centre of mass and then we generalize this by taking summation on differential masses..becoz for symmetrical differential elemnts its com is same as tht of entire bodya nd then to make it dimensionally consistent diveide by summation of mass

prakhar_galaxy

bhaiya first of all thanx for replying me
secondly i am not asking it for sake of JEE preparation
now i am studying 3 subjects to gain the max knowledge of the subjest coz then only i wud be able to attempt the paper better
secondly,i still didn't understand it
plz tell me it in detail if it's not lengthy
i know it has some link with weighted mass average but i don't it exactly
waiting for reply

deepak_agarwal

yaar it is an empirical model and these models do not have deric\vations..they r observed and experimental

prakhar_galaxy

ok thanx bhaiya

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