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6b_ec2 - Physics 613 Discussion Section extra-credit...

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Unformatted text preview: Physics 613 Discussion Section extra-credit problem — Week 2 Useful data: Atmospheric Pressure: PM = 101,000 Pa 1 L I ' — D 3 .4! Density of Water. fl”)? — 1000 kU/i'fl V] i: E s} 3 pi); A gardener holds a hose a height h = 1.25 meters above the ground. A stream of WflIBI' leaves the hose, traveling horizontaily, and hits the ground a distance L 2.16 meters from the gardener. a} What is the speed v of thc water as it Ieaves the hose? (Hint: The water behaves iike an object in projectile motion, like you studied in Physics 6A.) {If you can‘t figure out this part, make up an}.r reasonable answer so you can continue with part b) You examine the hose more closely. The main part of the hose has a radius r1: 2 em. The nozzle is narrower, with a radius r3: {.15 em. hail-in boil“ CI”?— h) In part (a), you calculated the speed 122 of the water leaving the nozzle. What is the speed v! of the water in the main part of the hose? e) What is the pressure .’-"Jr of the water in the main boo},r of the hose? (Him: the water leaving the nozzle is in direct contact, with the air, so it must have the same pressure as the atmosphere outside?) ...
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