Physics 15200- HW23

Physics 15200- HW23 - What net Force does this pressure...

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lai (yl8859) – HW23 – Ross – (15200) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A cowboy at a dude ranch flls a horse trough that is 1 . 3 m long, 63 cm wide, and 45 cm deep. He uses a 2 . 3 cm diameter hose From which water emerges at 2 . 1 m / s . How long does it take him to fll the trough? Answer in units oF min. 002 10.0 points A large storage tank is flled to a height 73 cm. The tank is punctured with a small hole at a height 21 cm From the bottom oF the tank. h h 0 How Far From the tank will the stream land? Assume that the tank is very large so that the velocity oF the liquid at the top oF the tank is zero. Answer in units oF cm. 003 (part 1 oF 2) 10.0 points IF wind blows at 18 . 8 m / s over the rooF oF your house, what is the pressure di±erence at the rooF between the inside and outside air? Use an air density oF 1 . 29 kg / m 3 . Answer in units oF Pa. 004 (part 2 oF 2) 10.0 points
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Unformatted text preview: What net Force does this pressure di±erence produce on a rooF having an area oF 174 m 2 ? Answer in units oF N. 005 (part 1 oF 2) 10.0 points A liquid oF density 1286 kg / m 3 ²ows with speed 2 . 66 m / s into a pipe oF diameter 0 . 14 m . The diameter oF the pipe decreases to 0 . 05 m at its exit end. The exit end oF the pipe is 6 . 87 m lower than the entrance oF the pipe, and the pressure at the exit oF the pipe is 1 . 3 atm . P 1 2 . 66 m / s . 14 m P 2 v 2 . 05 m 1 . 3 atm 6 . 87 m What is the velocity v 2 oF the liquid ²owing out oF the exit end oF the pipe? Assume the viscosity oF the ²uid is negligible and the ²uid is incompressible. The acceleration oF gravity is 9 . 8 m / s 2 and P atm = 1 . 013 × 10 5 Pa. Answer in units oF m / s. 006 (part 2 oF 2) 10.0 points Applying Bernoulli’s principle, what is the pressure P 1 at the entrance end oF the pipe? Answer in units oF Pa....
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