8. A boy is pressing a thumbtack into a piece of wood with a force of 20 N. The surface area of head of thumbtack is 1cm' and the cross-section area of the tip of the thumbtack is 0.01cm”. Calculate 2 a) The pressure exerted by boy's thumb on the head of thumbtack. b) The pressure of the tip of the thumbtack on the wood.
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