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12. Vertical oscillation of loaded spring in water die out rapidly. a) Name the type of Oscillation here. b) How can you maintain the oscillation of loaded spring in water. c) A Girl swings in sitting position on a swing. How will the period of the swing be effected if she stands up.

a) Damped Oscillation

(b) If some energy is feeded to the loaded spring at the same rate at which it is dissipating energy,the oscillation of the loaded spring in water can be maintained.

Here l is the distance between the point of suspension of the swing and centre of gravity (C.G) of the girl-swing system. As the girl stands up, the C.G. of the oscillating system is raised. Consequently, the value of l and hence time period decreases.