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No it is a 2 stoke.
Let,Coefficient of viscosity of liquid = etaRadius of sphere = avelocity of sperical body = vDimensionally it can be proved thatF = k eta*a*vExperimentally Stoke found thatk = 6*pitherefore, F = 6*pi*eta*a*vThis is Stoke's law.
Hanley, Stoke-on-Trent
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Technically, in an ideal experiment, where there is lack of any opposing forces like air drag and friction, the period of oscillation of a pendulum only depends on the length of string (i.e, for r<<L). However, in presence of air drag, a force opposite to the velocity of the bob reduces the energy of oscillations, so it also changes the period of oscillations. acc to a law similar to stoke's law Fv = -bv where 'b' is a constant and depends on medium and the bob. So, the force acting on bob is the resultant of -w2x and -bv. this is how the period of oscillation depends on the velocity of pendulum bob.