Posted by Ray on Tuesday, September 21, 2010 at 8:10pm.
a pendulum of the length L is suspended from the ceiling of an elevator. When the elevator is at rest , the period of the pendulum is T. In instant when the pendulum reaches its highest position the elevator starts the free fall. What is the period of the pendulum if the elevator is freely falling?

physiscs  bobpursley, Tuesday, September 21, 2010 at 8:19pm
If the elevator is falling, the pendulum is falling, so it is not oscillating.

physiscs  Ray, Tuesday, September 21, 2010 at 9:01pm
so what?

physiscs  Jay, Monday, March 11, 2013 at 12:47am
For other viewers who didn't understand like Ray.. Since its not oscillating there is no period, therefore it is 0.

physics  Caspar, Wednesday, December 3, 2014 at 8:49pm
No oscillation means that the period is infinity. If the period were zero, the pendulum would be moving with infinite velocity.

physiscs  Anonymous, Thursday, September 22, 2016 at 7:15pm
0 second

physiscs  kamaluddin, Sunday, January 1, 2017 at 4:19am
the time period would be infinte. t=sqrt(1/ga) a=9.8
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