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Question Number 32713 by byaw last updated on 31/Mar/18

A iniform rod of length 2a and weight W  is smoothly pivoted to a fixed point  at A. A load of weight 2W is attached  to the end B. The rod is kept horizontally  by a string attached to the midpoint  D of the rod and to a point C vertically  above A.   If the length of the string is 2a, find,  in terms of W, the tension in the  string and the magnitude of the  reaction at the pivot.

$$\mathrm{A}\:\mathrm{iniform}\:\mathrm{rod}\:\mathrm{of}\:\mathrm{length}\:\mathrm{2}{a}\:\mathrm{and}\:\mathrm{weight}\:{W} \\ $$$$\mathrm{is}\:\mathrm{smoothly}\:\mathrm{pivoted}\:\mathrm{to}\:\mathrm{a}\:\mathrm{fixed}\:\mathrm{point} \\ $$$$\mathrm{at}\:{A}.\:\mathrm{A}\:\mathrm{load}\:\mathrm{of}\:\mathrm{weight}\:\mathrm{2}{W}\:\mathrm{is}\:\mathrm{attached} \\ $$$$\mathrm{to}\:\mathrm{the}\:\mathrm{end}\:{B}.\:\mathrm{The}\:\mathrm{rod}\:\mathrm{is}\:\mathrm{kept}\:\mathrm{horizontally} \\ $$$$\mathrm{by}\:\mathrm{a}\:\mathrm{string}\:\mathrm{attached}\:\mathrm{to}\:\mathrm{the}\:\mathrm{midpoint} \\ $$$${D}\:\mathrm{of}\:\mathrm{the}\:\mathrm{rod}\:\mathrm{and}\:\mathrm{to}\:\mathrm{a}\:\mathrm{point}\:{C}\:\mathrm{vertically} \\ $$$$\mathrm{above}\:{A}.\: \\ $$$$\mathrm{If}\:\mathrm{the}\:\mathrm{length}\:\mathrm{of}\:\mathrm{the}\:\mathrm{string}\:\mathrm{is}\:\mathrm{2}{a},\:\mathrm{find}, \\ $$$$\mathrm{in}\:\mathrm{terms}\:\mathrm{of}\:{W},\:\mathrm{the}\:\mathrm{tension}\:\mathrm{in}\:\mathrm{the} \\ $$$$\mathrm{string}\:\mathrm{and}\:\mathrm{the}\:\mathrm{magnitude}\:\mathrm{of}\:\mathrm{the} \\ $$$$\mathrm{reaction}\:\mathrm{at}\:\mathrm{the}\:\mathrm{pivot}. \\ $$

Commented by byaw last updated on 02/Apr/18

please help

$${please}\:{help} \\ $$

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