a pendulum is mounted in an elevator that moves down with constant acceleration. how will the the period change??

Asked by n jain | 21st Mar, 2011, 12:00: AM

Expert Answer:

Dear student,
normally period for pendulum is T = 2π√(L/g)

if we put into elevator and it goes up

then T = 2π√(L/9.8+a)

g = 9.8+a because if elevator goes up and you feel to go down that is why g is bigger. and string tension must support the weight and acceleration upward and also provide restore force, just as if the elevator were at rest in gravity field g = 9.8+a. T will be shorter .
Hope this helps.

Answered by  | 21st Mar, 2011, 10:39: AM

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