JEE Main 2022 · 29 Jul · Shift 2 · Physics Q57

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PhysicsInteger+4 / -1Question 57 of 90

The metallic bob of simple pendulum has the relative density 5. The time period of this pendulum is 10 s. If the metallic bob is immersed in water, then the new time period becomes $5\sqrt x$ s. The value of $x$ will be _______.

Your answer

Answer and worked solution

Official answer: 5

Buoyancy reduces g to $g\left(1-\frac15\right)=0.8g$ : $T'=\dfrac{10}{\sqrt{0.8}}=5\sqrt5$ s.

Answer: 5

Topics:Simple and compound pendulum Buoyancy and Archimedes' principle

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JEE Main 2022 · 29 Jul · Shift 2, Physics question 57