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MPA 3

# MPA 3 - MasteringPhysics Assignment Print View...

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Assignment 2- Week3 Due: 11:59pm on Friday, September 23, 2011 Note: To understand how points are awarded, read your instructor's Grading Policy . [ Switch to Standard Assignment View] Archimedes' Principle Learning Goal: To understand the applications of Archimedes' principle. Archimedes' principle is a powerful tool for solving many problems involving equilibrium in fluids. It states the following: When a body is partially or completely submerged in a fluid (either a liquid or a gas), the fluid exerts an upward force on the body equal to the weight of the fluid displaced by the body. As a result of the upward Archimedes force (often called the buoyant force ), some objects may float in a fluid, and all of them appear to weigh less. This is the familiar phenomenon of buoyancy . Quantitatively, the buoyant force can be found as , where is the force, is the density of the fluid, is the magnitude of the acceleration due to gravity, and is the volume of the displaced fluid. In this problem, you will be asked several qualitative questions that should help you develop a feel for Archimedes' principle. An object is placed in a fluid and then released. Assume that the object either floats to the surface (settling so that the object is partly above and partly below the fluid surface) or sinks to the bottom. (Note that for Parts A through D, you should assume that the object has settled in equilibrium.) Part A Consider the following statement: The magnitude of the buoyant force is equal to the weight of fluid displaced by the object. Under what circumstances is this statement true? Hint A.1 Archimedes' principle The statement of Part A is one way of expressing Archimedes' principle. ANSWER: for every object submerged partially or completely in a fluid only for an object that floats only for an object that sinks for no object submerged in a fluid Correct Use Archimedes' principle to answer the rest of the questions in this problem. Part B MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrintVi... 1 of 8 11-10-02 7:41 PM

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Consider the following statement: The magnitude of the buoyant force is equal to the weight of the amount of fluid that has the same total volume as the object.
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