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- A light balloon filled with helium of density 0.179 kg/m³ is tied to a light string of length L = 5.45 m. The string is tied to the ground, forming an "inverted" simple pendulum (shown in (a) of following figure). Air a 100->> L He Air L He i Determine the period of the motion (in s). Take the density of air to be 1.18 kg/m³. (Hint: Use an analogy with the simple pendulum. Assume the air applies a buoyant force on the balloon but does not otherwise affect its motion.)In an engine, a piston oscillates with simple harmonic motion so that its position varies according to the expression, x = 5.00 cos (4t+ (4t + 1/7) where x is in centimeters and t is in seconds. (a) At t = 0, find the position of the piston. cm (b) At t = 0, find velocity of the piston. cm/s (c) At t = 0, find acceleration of the piston. cm/s² (d) Find the period and amplitude of the motion. period amplitude S cmA disk of radius 0.25 meters is attached at its edge to a light (massless) wire of length 0.50 meters to form a physical pendulum. Assuming small amplitude motion, calculate its period of oscillation. For a disk, I = (1/2)MR2 about its center of mass.
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