(c) Either estimating from the graph (μs= 0.60, upper curve) or calculated it more carefully leads to v= 41.3 m/s = 149 km/h when θ= 10º = 0.175 radian. (d) Similarly (for s= 0.050, the lower curve) we find v= 21.2 m/s = 76.2 km/h when = 10º = 0.175 radian. 62. (a) To be on the verge of sliding out means that the force of static friction is acting “down the bank” (in the sense explained in the problem statement) with maximum possible magnitude. We first consider the vector sum F→of the (maximum) static friction force and the normal force. Due to the facts that they are perpendicular and their magnitudes are simply proportional (Eq. 6-1), we find
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