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NEET2001PhysicsOscillationsActual

The time period of a simple pendulum is T remaining at rest inside a lift. Find the time period of pendulum when lift starts to move up with an acceleration of g / 4 .

Options

  1. AT
  2. BT / 2
  3. C2 T / 5
  4. D2 T / 5 .

Correct answer

D. 2 T / 5 .

Step-by-step solution

When the lift is at rest, the time period of the simple pendulum is T=2 l g Now, if the lift is moving up with an acceleration g 4 then the effective acceleration due to gravity aligned & g^ =g+ g 4 = 5 g 4 & Time period T^ =2 l g^ &=2 l 5 g / 4 &= 2 5 2 l g = 2 5 T aligned

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