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A sheet of paper is attached to the door of your refrigerator by a magnet. The coefficient of static friction between the fridge door and

A sheet of paper is attached to the door of your refrigerator by a magnet. The coefficient of static friction between the fridge door and the paper is 0.8, and between the paper and the magnet is 1.8. The mass of the paper is 5 gram, the mass of the magnet is 10 gram. What is the magnitude of the minimum force with which the magnet must be attracted to the fridge, so the note sticks?

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