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You desire to use the horizontal force ?⃑ air from a jet of air created by...

You desire to use the horizontal force ?⃑ air from a jet of air created by a fan to hold a 5.0 kg block stationary against a vertical wall by taking advantage of static friction. If the coefficient of static friction between the block and the wall is 0.30, what is the weakest that ?⃑ air can be and still keep the block from falling?

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