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Physics- Simple machines

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A wheel and axle arrangement has an axle with a diameter of 25cm. A rope is wrapped around the axle and is supporting a load of 2 tonnes.
1) If the mechanical advantage of the system is 30, determine the diameter of the wheel___________m.
2)Determine the effort required to maintain the system equilibrium ______N.

Need a little help with the formulas. Thanks.

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