A In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the picture. The tire remains stationary in spite of the three pulls. Alex pulls with force F of magnitude 212 N, and Charles pulls with force Fc of magnitude 187 N. Note that the direction of Fc is not given. What is the magnitude of Betty's force FB if Charles pulls in (a) the с direction drawn in the picture or (b) the other possible direction for equilibrium? 153° Alex Charles Betty

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!