Wednesday, October 24, 2001
Announcements:
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Exam 2 is scheduled for Friday, October 26
Chapter 9: Solids and Fluids
Stress = F/A (similar to pressure)
Strain = dL/L
Elastic modulus = Stress/Strain
Pressure = Force/Area, units of Pascals, 1 Pa = 1
N/m2
Density = Mass/Volume
P = Po + Dgh, Po = 1 atm = 1.013 x 105 Pa = 14.7
psi
Archimedes' Principle: Buoyant Force = weight of fluid displaced
by an immersed object
Ponderables:
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What determines whether an object floats?
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What is the density of water?
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What is the density of ice?
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How much water is displaced by a floating object?
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How much water is displaced by a submerged (sunken) object?
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Does an object weigh more or less in a vacuum?
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How much less does an aluminum block "weigh" in water (V = 578 cm^3)
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What happens to the water level in a glass as the ice in it melts?
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A person in a boat floating in a small pond throws an anchor overboard.
Does the level of the pond rise, fall, or remain the same?
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Why does a can of Coke sink, but Diet Coke floats?
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How can you make a bowling ball float?
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What pressure can your lungs exert?
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How can atmospheric pressure be used to lift a heavy object?
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At what water depth would a diver experience a pressure of 2 atmospheres?
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What is the minimum size of a suction cup that could support the weight
of a typical adult (150 lbs)?
Assignments: