7.37 To determine the viscosity of a liquid, one hangs up andsmall steel ball with the mass m and the radius r in a linear springand measures the oscillation time r, in the air and the oscillationtime ta in the liquid. The resistance in the liquid is F, = u6trvwhere u is the viscosity and v speed. Neglect the lifting forceand determine the viscosity.7.30 A body with mass m, which is suspended in a spring with aspring constant k, is connected to the floor by a damper with adamping constant c. Determine which attenuation constant e causesthe system to be critically attenuated. Then select the dampingconstant c / 2 and determine the movement if the body in equilibriumis given a downward velocity vo

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