University Physics with Modern Physics with Mastering Physics (11th Edition)

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5.38: a) There is no net force in the vertical direction, so , 0 sin = - θ + w F n or . sin sin θ F mg θ F w n - = - = The friction force is ). sin ( k k k θ F mg n f - = = μ The net horizontal force is ) sin ( cos cos k k θ F mg θ F f θ F - μ - = - , and so at constant speed,
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