Prashant K.

asked • 11/14/16

Pendulum related doubts

Two simple pendulums of length 100cm and 121cm length start swinging together. (Note : Swing together means same phase)
 
(A) they will swing together again when the pendulum of length 100cm makes 10 oscillations
(B) they will swing together again when the pendulum of length 121cm makes 11 oscillations
(C) they will swing together again when the pendulum of length 100cm makes 11 oscillations
(D) they will swing together again when the pendulum of length 121cm makes 12 oscillations

1 Expert Answer

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Mark M. answered • 11/14/16

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100 cm pendulum's period is 1 sec.
121 com pendulum's period is 1.1 sec.
 
When are they in synch again?
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Prashant K.

The questions contain answer options.
You just tell me the right option and the calculation process
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11/15/16

Mark M.

Calculation is: T = 2π√(L/g), where T is the period, L is the length of the pendulum, and g is the force of gravity.
What is the least common multiple of 1 and 1.1?
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11/15/16

Prashant K.

Not getting it .. Sorry
 
Please look over the answer options.
I just want to know, after how many oscillations both pendulum will swing together again?
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11/15/16

Mark M.

(C)
BTW, in what level of physics are you enrolled?
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11/15/16

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