In about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by

Question

In about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter with the thumb of each hand on one side and the fingers on the other side (see the figure). Sincosky's mass was 80.0 kg. If the coefficient of static friction between hand and rafter was 0.700, what was the least magnitude of the normal force on the rafter from each thumb or opposite fingers? (After suspending himself, Sincosky chinned himself on the rafter and then moved hand-over-hand along the rafter. If you do not think Sincosky's grip was remarkable, try to repeat his stunt.) Number Units

Explanation / Answer

least magnitude=0.7*80*9.8=548.8 N

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