WBJEE · Physics · Laws of Motion
A simple pendulum, consisting of a small ball of mass \(m\) attached to a massless string hanging vertically from the ceiling, is oscillating with an amplitude such that \(T_{\max }=2 T_{\min }\) where \(T_{\max }\) and \(T_{\min }\) are the maximum and minimum tension in the string respectively. The value of maximum tension \(\mathrm{T}_{\max }\) in the string is
- A \(\frac{3 m g}{2}\)
- B \(\mathrm{mg}\)
- C \(\frac{3 m g}{4}\)
- D \(3 \mathrm{mg}\)
Answer & Solution
Correct Answer
(A) \(\frac{3 m g}{2}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{T}_{\min }=m g \cos \theta\) \(\mathrm{T}_{\max }=\mathrm{mg}+\frac{\mathrm{mv}^{2}}{\mathrm{I}}=\mathrm{mg}+\frac{\mathrm{mv}^{2}}{\mathrm{I}}\) \(\frac{1}{2} \mathrm{mv}^{2}=\mathrm{mgl}(1-\cos \theta)\) \(\mathrm{T}_{\max }=2 \mathrm{~T}_{\min }\)…
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