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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)

 


 


 


 


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

Grade:12

1 Answers

anandpal shekhawat
8 Points
12 years ago
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

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