Mechanics> Newton's...
Two persons of equal height are carrying a long uniform of of length l.They are at distance l/4 & l/6 from nearest end of the rod.The ratio of normal reaction at their heads is
a) 2:3
b)1:3
c)4:3
d)1:2
Two persons of equal height are carrying a long uniform of of length l.They are at distance l/4 & l/6 from nearest end of the rod.The ratio of naormal reaction at their heads is
a) 2:3
b)1:3
c)4:3
d)1:2
1 Answers
Take the moment about centre of mass of system. since the COM doesnot change,net moment abt it is zero
COM is at l/4 from A and l/3 from B
let N1 and N2 be normal reactions
then, N1*l/4 = N2*l/3
N1/N2 = 4/3
option C
--
regards
Ramesh
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