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a) Explain why it is easier to push a door open as far away from its hinge as possible.
b) The diagram below shows a door hinged at one end.
A minimum moment of 43.5 N m is required to swing the door. What is the distance between a force F and the hinges if a person applies the force F of 25 N just enough to meet the minimum moment?
A spanner of length 250 cm is used to turn a nut with a moment of 120 Nm. Calculate the force needed to produce this moment.
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