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Gundoos 1234 Grade: 11
        

a smooth rod of 4kg rests on two supports A and B.


From a point c at its centre 9kg is suspended by a string of length 1 m. when θ is 30 deg it is released from rest. find maximum displacement of rod.


 


ans given is 0.2 m


 


please explain

6 years ago

Answers : (1)

Pramod J AskiitiansExpert-IIT-B
36 Points
										

Dear student,


Elasticity and area of cross section are required to find the deflection only due to weight.


let x be the initial deflection,


force due to pendulum is maximum when it is at mean position 


=> velocity at mean position is = [2g*l(1-cos(theta)]^1/2


force at mean position = mv^2/l


=> 9*g/1 = 90N


so maximum deflection will be 2x.

6 years ago
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