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Q.

Mass of bob of a simple pendulum is 10 gm. It makes 10 oscillations in 15 seconds passes the mean position with a speed 4 cm/sec, work done by the tension in the suspension thread in oscillation is :

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a

5.6 J

b

6.8 erg

c

12.4 erg

d

zero

answer is D.

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Detailed Solution

The displacement in a pendulum is always perpendicular to the  tension in the string .F.d = 0 Thus, work done is equal to zero
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