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16 May 2011 23:44:54 IST

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Two pendulums with natural frequencies f1 and f2 are released in phase at same instant of time. Afte

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Two pendulums with natural frequencies f1 and f2 are released in phase at same instant of time. After what interval will they come in phase again?a) 1/f1 + 1/f2b) 1/f1 - 1/f2c) 1/(f1.f2)d) L.C.M of 1/f1 and 1/f2

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GOPAKUMAR

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17 May 2011 07:25:57 IST

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d)L.C.M of 1/f1 and 1/f2

hemang

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17 May 2011 07:59:24 IST

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the answer is (d) that is the lcm of 1/f1 and 1/f2.

rancho

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17 May 2011 15:56:25 IST

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yup, answer is (D).but please give me details....

GOPAKUMAR

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17 May 2011 17:10:05 IST

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CONSIDER THE FOLLOWING CASE

YOU WILL FIND THE THEY HAVE DIFFERNT I.E IF THE FIRST HAS A TIME PERIOD 1/F THE THE SECOND ONE HAS A TIME PERIOD 2/F AND CLEARLY FROM THE FIG. WE CAN GET THAT THE TWO ARE IN PHASE INITIALLY AT t=0 and again come in phase at t=2/F (I.E THE LEAST TIME WHEN THEY START FROM ZERO DISPLACEMENT TOGETHER AND THIS CAN BE MATHEMATICALLY EXPRESSED AS LCM OF THE TWO TIME PERIODS).Hope it's clear now.

sushiljaggi

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2 Apr 2012 11:48:45 IST

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Two pendulums with natural frequencies f1 and f2 are released in phase at same instant of time. Afte

kartikAIR1

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2 Apr 2012 12:20:33 IST

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My answer goes different way

t = 1/(f₁-f₂)

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