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Q1. A 4.22 box sits at rest at the bottom of a ramp that is 7.74 long and that is inclined at 40.0 above the horizontal. The coefficient of kinetic friction is 0.40, and the coefficient of static friction is 0.50.

Q2. A banked circular highway curve is designed for traffic moving at 66 km/h. The radius of the curve is 207m. Traffic is moving along the highway at 46 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road?

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