1.

A uniform thin .................

Answer»


SOLUTION :Force on ELEMENT dx on rod (taken at distance x from centre of EARTH) is
`df=(m/R dx)(GM)/x^(2)`
Total force on rod is
`F= int df=(GMm)/R underset(R)OVERSET(2R)(int) 1/x^(2) dx`
`=(GMm)/R [-1/x]_(R)^(2R)`
`=(GMm)/(2R^(2))`


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