Task data: M (moment of force of a given lever) = 15 N * m; F (force applied to the shoulder) = 30 N.
The leverage of a given leverage can be expressed from the formula: M = F * x, whence x = M / F.
Let’s perform the calculation: x = 15/30 = 0.5 m (50 cm).
Answer: The arm of the given lever is 50 centimeters long.
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