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Grade: 12
        

 


 


 


 


In the diagram block A & B are of same mass M & the mass of the block C is M1. frction is present only under the block A.the whole system is suddenly release from rest.the minimum coefficient of friction to keep to mkeep the block A at the state of rest.


a) M1/M


b) 2M1/M


c) M1/2M


d) none of these


ans (b)


 


4751-1687_6545_untitled1.jpg

10 years ago

Answers : (1)

anandpal shekhawat
8 Points
							hi,
    let block C travelled a distance x downwards and so block B trvelled the same distance horizontally 
work done by gravity= -M1gx
P.E of spring= 1/2Kx^2
before the block A starts sliding Kx= #Mg   (# is coeff. of friction)
work done by gravity= P.E of spring
solving both eqns.
        #= 2M1/M 
						
10 years ago
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