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A 0.25 kg block attached to a spring of spring constant 36.5 N/m is oscillating on a horizontal frictionless surface as shown. At t=0 , the block is located at point x = 13.6 cm and has an x-velocity of -2.2 m/s.
(a) What is the amplitude of the motion of the block?
(b) What is the kinetic energy of the block when the acceleration of the block is zero?
(c) What is the speed of the block at the instant the kinetic energy of the block is twice the potential energy stored in the spring?
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Four equal charges of +4.9×10-6 C are placed on the corners of one face of a cube of edge length 7.0 cm. A charge of -4.9×10-6 C is placed at the center of the cube. What is the magnitude of the force on the charge at the center of the cube?
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