why spanner has long arm?
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A spanner with a long handle is preferred to tighten screw in heavy vehicles because it required less force to be applied. Explanation: ... When the length of the spanner's lever arm (i.e.,) the handle is more, then less force is required to produce the moment of force .
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Spanner has a long handle to produce larger turning moment and small force is applied at the end of handles.
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