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Chap9 - 3 Strategy Use the definition of average pressure...

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3. Strategy Use the definition of average pressure. Solution Compute the average pressure on the soles of the feet. av 2 (90.0 kg)(9.80 N kg) 22 kPa 2(0.020 m ) F mg P A A = = = = 8. Strategy The pressure increases by an amount equal to the force divided by the cross-sectional area of the piston. Solution Compute the pressure increase. 5 2 4.40 N 88.0 kPa 5.00 10 m F P A Δ = = = × 14. Strategy Since d is depth, d is height. Use Eq. (9-4). Solution Find the height that water can be sucked up a straw. atm atm 3 3 2 10 kPa
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