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Lecture17_Pushkar_2011

# Lecture17_Pushkar_2011 - PHYSICS 220 Lecture 18 Fluid...

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Lecture 17 Purdue University, Physics 220 1 Lecture 18 Fluid Dymanics 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 = ρ fluid V disp g F g = mg = ρ object V object g Object sinks if ρ object > ρ fluid Object floats if ρ object < ρ fluid If object floats… F B = F g Therefore ρ fluid V disp g = ρ object V object g
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 =   ρ W g V displaced W water made from ice = ρ W g V water made from ice W ice = W water made from ice V displaced = V water made from ice

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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

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Lecture17_Pushkar_2011 - PHYSICS 220 Lecture 18 Fluid...

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