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Unformatted text preview: Chapter 7 Motion at High Speeds Last Time: s Forces in fluids Pressure in a bounded fluid transmitted equally to all surfaces of container; acts at right angles Pressure in unbounded fluid only a function of depth s Buoyant force: Equal to weight of fluid displaced by object s Convection: due to relative strengths of gravity and buoyant forces, sets up currents I have read all of chapter 7 A. Yes B. No Wind currents s Convection comes when hot air rises and cool air rushes in to take its place. s It rises because it is l e s s d e n s e , not because it is hot . What is true about a floating steel battleship? A. The weight of the entire ship equals the weight of the displaced water. B. The weight of the part of he ship under the water the ship under the water line equals the weight of the displaced water. C. The density of water is greater than the density of steel. Albert Einstein (1879-1954) s He was given one Nobel prize* but could have easily been given 4. Special Relativity General Relativity Brownian Motion Photoelectric Effect * Motion at High Speed s We test theories at the extreme limits. The natural test of Newtons laws of motion are how they behave at high speeds. s High speed means near the speed of light. Speed of light = c = 186,000 miles/sec = 3 x 10 5 km/sec s We will never approach moving that fast ourselves. Even the astest objects in our lives travel but a fraction of the speed fastest objects in our lives travel but a fraction of the speed of light. 20 miles b Measuring Motion s Motion is always measured r e l a t i v e to something else....
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- Winter '08