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Grade 12Mechanics

please explain sir ….....
as soon as possible.........

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Profile image of muskan
6 Years agoGrade 12
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2 Answers

Profile image of Ayush_Deep
ApprovedApproved Tutor Answer6 Years ago
The correct answer will be option A. 
First find moment of inertia about hinge point I= 3ml²/2
Now rotate the frame by angle ¢ . then the torque applied by spring K2 will be k2 *¢ * (L/√3)²
Torque by k1 = k1 *¢*(√3L/2)²
Net torque is calculated by adding both torque and is equal to iw²¢
By this you can calculate W and thus w/2π is frequency.
Profile image of Vikas TU
ApprovedApproved Tutor Answer6 Years ago
Dear student 
rotate the frame by angle ¢ . then the torque applied by spring K2 will be k2 *¢ * (L/√3)²
Torque by k1 = k1 *¢*(√3L/2)²
Net torque is calculated by adding both torque and is equal to iw²¢
By this you can calculate W and thus w/2π is frequency