## Book: HC Verma - Concepts of Physics Part 1

### Chapter: 12. Simple Harmonic Motion

#### Subject: Physics - Class 11th

##### Q. No. 47 of Exercises

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47
##### The ear-ring of a lady shown in figure (12-E18) has a 3 cm long light suspension wire (a) Find the time period of small oscillations if the lady is standing on the ground. (b) The lady now sits in a merry-go-round moving at 4 m s-1 in a circle of radius 2 m. Find the time period of small oscillations of the ear-ring.

(a) 0.34 s

(b) 0.30 s

Sol: (a) given length l= 3cm=0.03m

Time period

=

=0.3476 sec

(b) Now, lady is in circular motion on merry-go-round of radius r=2m. A centripetal force also acts on the earring now. Which is

the resultant acceleration on the ear-ring will be

=

= 0.30 sec.

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