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The door to our classroom is kept open with a doorstop. The door is 1.7m wide and has a mass of 10kg. The door in

The door to our classroom is kept open with a doorstop. The door is 1.7m wide and has a mass of 10kg. The door in is equilibrium. What is the force of the hinge closing the door if the frictional coefficient of the door/doorstop is 0.75?

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