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problem05_91

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

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5.91: a) Let B n be the normal force between the plank and the block and A n be the normal force between the block and the incline. Then, θ w n B cos = and . cos 4 cos 3 θ w θ w n n B A = + = The net frictional force on the block is θ μ μ cos 5 ) ( k k w n n B A = + . To move at constant speed, this must balance the component
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Unformatted text preview: of the block’s weight along the incline, so , cos 5 sin 3 k θ w θ w = and . 452 . 37 tan tan 5 3 5 3 k = ° = = μ θ...
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