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(a) A man weighing 794 N lies on a bed of nails. Find the average pressure exerted by a nail on his skin if there are 1160 nails and the flattened point on each nail has a radius of 0.500 mm.

(b) Calculate the pressure exerted on the skin by an acupuncture needle of radius 0.100 mm applied with a force of 4.80 N.

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