# Lecture17 - PHYSICS 220 Lecture 17 Fluid Dymanics Textbook Sections 10.4-10.5 Lecture 17 Purdue University Physics 220 1 Archimedes Principle

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Lecture 17 Purdue University, Physics 220 1 Lecture 17 Fluid Dymanics Textbook Sections 10.4-10.5 PHYSICS 220

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Lecture 17 Purdue University, Physics 220 2 Archimedes’ Principle • Buoyant Force F B – Weight of fluid displaced – F B = fluid V disp g – F g = mg = object V object g – Object sinks if object > fluid – Object floats if object < fluid • If object floats… – F B = F g – Therefore fluid V disp g = object V object g – Therefore V disp / V object = object / fluid
Lecture 17 Purdue University, Physics 220 3 Suppose you float a large ice-cube in a glass of water, and that after you place the ice in the glass the level of the water is at the very brim. When the ice melts, the level of the water in the glass will: A) Go up, causing the water to spill out of the glass B) Go down C) Stay the same CORRECT Exercise W ice = F B = W g V displaced W water = W g V water W ice = W water V displaced = V water

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Lecture 17 Purdue University, Physics 220 4 Exercise Which weighs more: A) A large bathtub filled to the brim with water B) A large bathtub filled to the brim with water with a battle-ship floating in it C) They weigh the same Tub of water Tub of water + ship Overflowed water CORRECT Weight of ship = Buoyant force = Weight of displaced water
Lecture 17 Purdue University, Physics 220 5 iClicker Which weighs more: A) A large bathtub filled to the brim with water B) A large bathtub filled to the brim with water with a battle-ship sinking to the bottom C) They will weigh the same Tub of water Tub of water + ship Overflowed water CORRECT Weight of ship > Buoyant force = Weight of displaced water

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Lecture 17 Purdue University, Physics 220
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## This note was uploaded on 04/23/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue University-West Lafayette.

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Lecture17 - PHYSICS 220 Lecture 17 Fluid Dymanics Textbook Sections 10.4-10.5 Lecture 17 Purdue University Physics 220 1 Archimedes Principle

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