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Physics - SHM Question with Solution | TestHub

PhysicsSHMMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

A pendulum of length $200 c m$ is horizontal, when its bob of mass $200 g m$ , is released. It has $90 %$ of initial energy when the bob reaches the lower most point. Speed of the bob at this point is

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Answer:

Solution:

$v = \sqrt{2 g h}$ when $100 %$ energy gets converted.

But here $\frac{1}{2} m v^{2} = 0.9 m g h$

i.e. $v = \sqrt{1.8 g h} \Rightarrow v = \sqrt{1.8 \times 10 \times 2} = 6 m s^{- 1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:SHMSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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