A pendulum is suspended in a lift and its period of oscillation is T 0 when the lift is stationary.
(i) What will be the period T of oscillation of pendulum, if the lift begins to accelerate downwards with an acceleration equal to 
?
(ii) What must be the acceleration of the lift for the period of oscillation of the pendulum to be 
?
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(i) 2T 0 , (ii) 3g upwards
Sol. (i) T 0 = 2 π 
⇒ T = 2 π 
g eff = g – 
= 
So, time period T = 2 π 
⇒ T = 2T 0
(ii) 
= 2 π 
= 2 π 
g eff = 4g
⇒ a = 3g upwards
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