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Serway_PSE_quick_ch14

Serway_PSE_quick_ch14 - Physics for Scientists and...

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Unformatted text preview: Physics for Scientists and Engineers, 6e Chapter 14 – Fluid Mechanics Suppose you are standing directly behind someone who steps back and accidentally stomps on your foot with the heel of one shoe. Would you be better off if that person were 1 2 50% 50% 1 2 3 4 5 1. a large professional basketball player wearing sneakers 2. a petite woman wearing spike-heeled shoes? Because the basketball player’s weight is distributed over the larger surface area of the shoe, the pressure ( F / A ) that he applies is relatively small. The woman’s lesser weight is distributed over the very small cross- sectional area of the spiked heel, so the pressure is high. The pressure at the bottom of a filled glass of water ( ρ = 1000 kg/m 3 ) is P . The water is poured out and the glass is filled with ethyl alcohol ( ρ = 806 kg/m 3 ). The pressure at the bottom of the glass is 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. smaller than P 2. equal to P 3. larger than P 4. indeterminate Because both fluids have the same depth, the one with the smaller density (alcohol) will exert the smaller pressure. Several common barometers are built, with a variety of fluids. For which fluid will the column of fluid in the barometer be the highest? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. mercury 2. water 3. ethyl alcohol 4. benzene All barometers will have the same pressure at the bottom of the column of fluid – atmospheric pressure. Thus, the barometer with the highest column will be the one with the fluid of lowest density. You have invented a spacesuit with a straw passing through the faceplate so that you can drink from a glass while on the surface of a planet. Out on the surface of the Moon, you attempt to drink through the straw from an open glass of water. The value of g on the Moon is about one sixth of that on Earth. Compared to the difficulty in drinking through a straw on Earth, you find drinking through a straw on the Moon to be 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. easier 2. equally difficult 3. harder 4. impossible Because there is no atmosphere on the Moon, there is no atmospheric pressure to provide a force to push the water up the straw.force to push the water up the straw....
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Serway_PSE_quick_ch14 - Physics for Scientists and...

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