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Unformatted text preview: 1 Practice Problems Supplement 4 PHY 131 Multiple Choice Questions & Free Response Questions (Fluids; Ch. 13 Giancoli 4 th ed.) SOLUTIONS 2 Information you may need; HYDROSTATICS (i.e. stationary liquids); Pressure, Gauge Pressure & Density; (note that from the density equation, you can also get the mass of an object by; ) Buoyant Force; Pascals Principle (Pressure within a fluid in a closed container is transmitted undiminished throughout the liquid) HYDRODYNAMICS (i.e. liquids in motion); Equation of Continuity ( Mass flow rate; unit = kg/sec ) ; Equation of Continuity ( Volume flow rate; unit = m 3 /sec ); Bernoullis Equation ; Poiseuilles equation; 3 4 Name ________________________________Date ______________ Prof. Pascuzzi PHY 131 Multiple Choice & Short Answer Questions 1) In words, what is the difference between gauge pressure and absolute pressure? 2) How is gauge pressure written as a function of depth in a liquid? 3) How is absolute pressure written? 4) In words, what does Archimedes Principle mean? Archimedes Principle states that the weight of the fluid displaced by a floating object is equal to the buoyant force supplied by the liquid exerted on the object. When an object is placed in a steady liquid, the object displaces (pushes aside) a volume of liquid whose weight is equal to the supporting force (buoyant force) that the liquid provides to hold the object up. When a floating object is totally submerged, the maximum amount of liquid has been displaced, and thus the maximum buoyant force is exerted on the object by the liquid. 5) How does the buoyant force on a floating object change as a function of the objects submergence? F B increasing as a floating object is continuously submerged until it is completely submerged, when FB reaches its maximum value, in accordance with . 6) What are two ways to determine if an object placed in a steady fluid will or will not float? Calculate the buoyant force and compare to weight of the object; if w > F B , it sinks. Compare object density to liquid density; if > , it sinks. 7) Explain what volume flow rate is. Volume flow rate is the cubic volume flow of fluid per unit time, such as m 3 per second. It describes the volume of fluid moving past a certain point every second. 8) Explain how pressure is related to velocity of fluid flow in the subject of hydrodynamics. According to Bernoullis equation ( the pressure within a fluid decreases as the velocity v of the fluid increases. Famous examples include the lift of an airplane wing (air as a fluid moves faster over the wings top surface, therefore causing less pressure above it, more below it, so the wing lifts), the inward movement of your shower curtain as water on the other side rushes past it and how your body tilts toward the train tracks as you stand by the rapidly incoming train that pushes air past you very rapidly. 5 A swimming pool has the dimensions shown in the drawing. It is filled with water to a uniform depth of 8.00 It is filled with water to a uniform depth of 8....
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 Fall '03
 Rijssenbeek

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