difficult question i guess..!!

VITEEE 2015 Guidance › Mechanics questions › difficult question i guess..!!

q) Given k1 = 1500 N/m, k2 = 500 N/m , m1 = 2kg and m2 = 1kg. Find
(a) potential energy stored in the springs in equilibrium, and
(b) work done in slowly pulling down m2 by 8cm.

the image is not clear i knw... but just try to understand..!!

#Physics #Mechanics

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Vivek @ Born this Way ·2012-03-22 01:09:06

In equilibrium, let extensions be x1 , x2 , then using force balancing. Find these. It should be easy.

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rahul ·2012-03-22 06:57:30

first part is perfectly easy...
but wha bout the second one...!!

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Vivek @ Born this Way ·2012-03-23 06:53:43

Okay. Let again the further extensions in them be y1,y2. Obviously y1+y2=8.

Now again, balance forces and find y1,y2. The work done = Change is PE of the springs.

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Aditya Bhutra ·2012-03-23 07:07:15

@ vivek - what about the change in PE of the masses ?

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Vivek @ Born this Way ·2012-03-23 07:40:28

Okay, so we need to include them too.

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difficult question i guess..!!

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