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Q.

A particle under the action of a SHM has a period of 3 s and under the effect of another it has a period 4 s. What will be its period under the combined action of both the SHM's in the same direction?

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a

7 s

b

5 s

c

2.4 s

d

0.4 s

answer is C.

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Detailed Solution

T=2πmk  or  T∝1kT has increased 43times. Hence, k'=916kWhen both are combined,         knet =k+k'=2516k or 2516timesHence, new time period will become 43times of 3 s or 2.4 s.
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