Q)
(chatquestion)...A simple pendulum is constructed from an aluminium sphere attached to a light rod. A second pendulum is constructed of the same length but with a brass sphere. The diameters of the two spheres are the same. The two pendulums are set in motion at the same time with the same amplitude of oscillation. After 10 min the amplitude of oscillation of the aluminium pendulum has decreased to one-half its initial value. By what factor has the amplitude of oscillation of the brass pendulum decreased at this time? (Assume that the damping force acting on a pendulum is directly proportional to the velocity of the sphere. The densities of aluminium and brass are 2.7 × 103 kg m−3 and 8.5 ×103 kg m−3, respectively.)
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