Cross Boyd

12/29/2023 · High School

16. The gage pressure in a liquid at a depth of 2.5 m is read to be 28 kPa . Determine the gage pressure in the same liquid at a depth of 9 m . 17. Consider a 55 -kg woman who has a total foot imprint area of \( 400 \mathrm{~cm}^{2} \). She wishes to walk on the snow, but the snow cannot withstand pressures greater than 0.5 kPa . Determine the minimum size of the snowshoes needed (imprint area per shoe) to enable her to walk on the snow without sinking. 18. (a) A 75.0 -kg man floats in freshwater with \( 3.00 \% \) of his volume above water when his lungs are empty, and \( 5.00 \% \) of his volume above water when his lungs are full. Calculate the volume of air he inhales called his lung capacityin liters. (b) Does this lung volume seem reasonable? 19. A hydraulic lift has a small piston with surface area \( 0.0020 \mathrm{~m} \mathrm{~m}^{2} \) and a larger piston with surface area \( 0.20 \mathrm{~m}{ }^{2} \). Assume your mass is 60 kg . If you stand at the smaller piston, how much mass can you lift at the larger piston? 20. A fluid that occupies a volume of 24 L weighs 225 N at a location where the gravitational acceleration is \( 9.80 \mathrm{~m} / \mathrm{s}^{2} \). Determine the mass of this fluid and its density. 21. Blood flows at an average speed of \( 0.40 \mathrm{~m} / \mathrm{s} \) in a horizontal artery of radius 1.0 cm . The average pressure is \( 1.4 \times 10^{4} \mathrm{~N} / \mathrm{m}^{2} \) above atmospheric pressure (the gauge pressure). (a) What is the average speed of the blood past a constriction where the radius of the opening is 0.30 cm ? (b) What is the gauge pressure of the blood as it moves past the constriction?