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A block of weight W produces an extension of 9cm when it is hung by an elastic spring of length 60cm and is in equlbrm.The spring is cut into 2 parts , one of length 40cm and the other 20cm they are connected in parallel.The same load W hangs in equlbrmsupported by both. The extension now is a) 9cm b)6cm c) 3cm d)2cm plzz give the full method rates assured


 A block of weight W produces an extension of 9cm when it is hung by an elastic spring of length 60cm and is in equlbrm.The spring is cut into 2 parts , one of length 40cm and the other 20cm they are connected in parallel.The same load W hangs in equlbrmsupported by both. The extension now is

a) 9cm   b)6cm    c) 3cm   d)2cm

 

plzz give the full method rates assured


Grade:upto college level

1 Answers

Manoj
11 Points
3 years ago
Spring constant for original spring W=k×9K is inversely proportional to length so spring constant for spring is 40cm =3/2kAnd fr 20cm length is 3k3k/2 + 3k =9k/2W=9/2kx9k=9/2kxX=2

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