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Hanging from a horizontal beam are nine ...

Hanging from a horizontal beam are nine simple pendulums of the following lengths: (a) 0.10, (b) 0.30, (c ) 0.70, (d) 0.80, (e ) 1.2 (f) 2.6 (g) 3.5 (h) 5.0 and (i) 6.2m. Suppose the beam undergoes horizontal oscillations with angular frequencies in the range from 2.00 rad/s to 4.00 rad/s. Which of the pendulums will be (strongly) set in motion?

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Pendulum discussed in (c ), (d) and (e )
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