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Home Work 4

# Home Work 4 - If the water is to rise 25 m(82 feet above...

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Augusto Gerbaud February 29, 2008 Home Work #4 Chapter 5 Exercises 20. Ice tea is often dispensed from a large jug with a faucet near the bottom. Why does the speed of tea flowing out of the faucet decrease as the jug empties? When the level of the liquid begins to get lower the pressure of the faucet decreases as well, and the energy of the tea goes down to. 24. How does pushing on the plunger of a syringe cause medicine to flow into a patient through a hollow hypodermic needle? When we push on the end of the syringe we raise its pressure thus causing a spike in the pressure of the medicine making the liquid go to the low pressure area which is the patient. Problems 6. If you submerge an 8-kg log in water and it displaces 10 kg of water, what will the net force on the log be the moment you let go of the log? DF = (8 kg)(9.8 m/s 2 ) = 78.4 N UF = (10 kg)(9.8 m/s 2 ) = 98 N NF = 98 N – 78.4 N = 19.6 N 11. Your town is installing a fountain in the main square.
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Unformatted text preview: If the water is to rise 25 m (82 feet) above the fountain, how much pressure must the water have as it moves slowly toward the nozzle that sprays it up into the air? p = ρgh = (1000 kg/m 3 )(9.8 m/s 2 )(25 m) = 245,000 Pa. Chapter 6 Exercises 12. When you mix milk or sugar into your coffee, you should move the spoon quickly enough to produce turbulent flow around the spoon. Why does this turbulence aid mixing? If you do not produce a turbulent flow then the things you are mixing will form a pattern of flow which will not help them mix. When you do cause turbulence the mix properly because small portions of each ingredient mix. Problems 4. You are trying to paddle a canoe silently across a still lake and know that turbulence makes noise. How quickly can the canoe and the paddle travel through water without causing turbulence? v = ((2300)(0.001 kg/m . s))/((1000 kg/m 3 )(1 m)) = 0.002 m/s...
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