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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 Aug 2007 14:53:35 IST
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a simple explanation would b....
when u measure, weight, u measure the "normal reaction"
so when u r standing in a pan of a spring balance , the spring force is the normal reaction. this normal reaction should balance all the vertical forces, since there is no acceleration when u r simply standing. now due to rotation of the earth, a centrifugal force also acts upwards. this force is given by mw2r. here r is the radius of the "circular element at the equator"(as u go above or below the equator, this radius decreases..try to visualise) which is the radius of the earth.
so the normal reaction and centrifugal force r in the same direction and gravitational force in the downward direction.
mg = N + mw2r
since the spring balance is assumed to measure weight, we get a wrong measurement here. so the "wrong" value of g is taken as g'. so "wrong" wt. = mg' = N
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