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

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5.74: a) The normal force will be cos sin mg F α α + , and the net force along (up) the ramp is ). cos (sin ) sin (cos ) sin cos ( sin cos s s s α μ α α μ α α μ α α + - - = + - - mg F F α mg mg F In order to move the box, this net force must be greater than zero. Solving for F , . sin cos cos sin s s α μ α α μ α - + mg F Since F is the magnitude of a force, F must be positive, and so the denominator of this
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