\(1\, m\) લંબાઈ સાથે બાંધેલ એક નાનો ગોળો એક ઉર્ધ્વ વર્તુળ દર્શાવે છે કે જેથી દોરીઓમાં મહત્તમ અને ન્યૂનતમ તણાવનો ગુણોત્તર \(5:1\) છે. ગોળાનો સૌથી ઉચ્ચતમ સ્થાન પાસે વેગ ............ \(m /s\) છે. \((g =10\, m/s^2\) લો.)

A \(0\)
B \(10\)
C \(5\)
D \(8\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(5\)

Step-by-step Solution

Detailed explanation

Let the speed of bob at lowest position be \(v _{1}\) and at the highest position be \(v _{2}\). Maximum tension is at lowest position and minimum tension is at the highest position. Now, using, conservation of mechanical energy,…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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