Lecture17

Physics 101: Lecture 17 Fluids Exam III Exam 2 is Mon Oct. 25, 7pm Review is Sun Oct. 24, 8pm Sign up for conflict by tomorrow!

Homework 9 Help ,[object Object],[object Object],[object Object],[object Object],[object Object],x y ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],M 3 T 3 M 3 g M 2 T 3 T 1 M 1 N M 1 g T 1 f

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object]

States of Matter ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Fluids

Qualitative Demonstration of Pressure y ,[object Object],[object Object],[object Object]

Atmospheric Pressure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Can demo

Pascal’s Principle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],W = F d cos  W 1 = F 1 d 1 = F 2 (A 1 / A 2 ) d 1 but: A 1 d 1 = V 1 = V 2 = A 2 d 2 = F 2 V 1 / A 2 = F 2 d 2 = W 2

Gravity and Pressure ,[object Object],[object Object],[object Object],1 2 P = F/A = mg / A Cup 1 has greater mass, but same area

Pascal’s Principle (Restated) ,[object Object],[object Object],[object Object],[object Object]

Dam ACT ,[object Object],[object Object],F = P A, and pressure is  gh. Same pressure, same area same force even though more water in B! B A A

Pressure and Depth Barometer: a way to measure atmospheric pressure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],For non-moving fluids, pressure depends only on depth. h p 2 =p atm p 1 =0

Preflight ,[object Object],[object Object],[object Object],h p a p=0 The atmospheric pressure applied to the liquid will only be able to lift the liquid to a limited height no matter how hard you suck on the straw. Certainly trees have developed some mechanism to transport water from ground level, through their vascular tissues, and to their leaves (which can be higher that 50 feet) [interesting topic for a James Scholar paper…] Only Superman . . . or Kobe Bryant can do that. [demo]

Archimedes’ Principle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Archimedes Example ,[object Object], F = m a F b – Mg – mg = 0  g V disp = (M+m) g V disp = (M+m) /  h A = (M+m) /  h = (M + m)/ (  A) = (51.2+9)/(1 x 4 x 4) = 3.76 cm [coke demo] M =  plastic V cube = 4x4x4x0.8 = 51.2 g h mg F b Mg

Summary ,[object Object],[object Object],[object Object],[object Object]

Lecture17

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