This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Version PREVIEW Test Homework Savrasov (39825) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Barge in Fresh Water 001 (part 1 of 2) 10.0 points A loaded flatbottom barge floats in fresh wa- ter. The bottom of the barge is 3 . 06 m below the water line. When the barge is empty the barges bottom is only 2 . 23 m below the water line. What is the difference between the pressure on the bottom of the loaded barge and the pressure at the water line? Correct answer: 29988 Pa. Explanation: Let : d 1 = 3 . 06 m and = 1000 kg / m 3 . P = d 1 g = 3 . 06 m (1000 kg / m 3 ) (9 . 8 m / s 2 ) = 29988 Pa . 002 (part 2 of 2) 10.0 points If the surface area of the bottom of the barge is 559 m 2 what is the weight of the load in the barge? Correct answer: 4 . 54691 10 6 N. Explanation: Let : d 2 = 2 . 23 m and a 1 = 559 m 2 . Weight in a bouyant, stable system is equal to the mass of the fluid displaced times grav- ity. This is known as Archimedes Principle. The mass of water displaced, and thus the mass of the load, is W = mg = ( d 1 d 2 ) a 1 g = (1000 kg / m 3 ) (3 . 06 m 2 . 23 m) (559 m 2 ) (9 . 8 m / s 2 ) = 4 . 54691 10 6 N . Bernoulli Principle 003 (part 1 of 4) 10.0 points Shown below is a cross-section of a verti- cal view of a pipe discharging a fluid into the atmosphere at its highest elevation. The pipe diameter increases and then remains con- stant. P i is the pressure and bardbl vectorv i bardbl is the speed of the fluid, at locations i = y , x , z , and u . y x z u If the fluid is incompressable and nonvis- cous, what is the relationship between the magnitude of the velocity v bardbl vectorv bardbl at position y and x ? 1. bardbl vectorv x bardbl = bardbl vectorv y bardbl 2. bardbl vectorv x bardbl < bardbl vectorv y bardbl correct 3. Indeterminable; not enough information is available....
View Full Document
- Fall '09