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A professor with an eraser in her hand leans against a blackboard...
A professor with an eraser in her hand leans against a blackboard as shown in the figure below. Her arm makes an angle of 30 Degree with the horizontal, and the force F = 50 N The coefficient of static friction between the craser nd the blackboard is mu s = 0.15 Does the craser slip? It was a dark and stormy night, and a driver advancing a long an icy road - assume that the friction between the tires and the road is zero - must negotiate a tum for which the road staces a cut an are of a circle of radius 320 m The road is banked at an angle of 5.1 Degree What is the speed with which the driver must take the curve to avoid sliding