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Q. A disk of radius R = 11cm is pulled along a frictionless surface with a force of F = 20 N by a string wrapped around the edge. At the instant when d = 26.0cm of string has unwound off the disk, what is the torque exerted about the center of the disk?

Q. A 20 000 N truck is acted upon by the force that decreases its speed from 10.00 m/s to 5.0 m/s in 5.0 sec. What is the magnitude of force?

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