An object of mass 0.5 kg is hung from a spring whose spring constant is 40 nt/m. the object is subjected to a resistive force given by - b v where v is the velocity in meters per second (a) if the damped frequency is of the undamped frequency, what is the value of the constant b? (b) what is the q of the system and by what factor is the amplitude of the oscillations reduced after 5 complete cycles? (c) if the mass is increased by a factor of 3 (keeping all other parameters fixed) by what factor does the q change?

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People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina.with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)