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Physics131_L08WI10

# Physics131_L08WI10 - Physics 131 Mechanics Le cture8...

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Physics 131 - Mechanics Lecture 8 January 25, 2010 Homeyra Sadaghiani

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Oct 24, 2010 Physics 131 - Lecture 7 Announcements HW#3 is due at 9 a.m. on Wed, January 27 th First Midterm is on Friday Jan. 29 th . 2
On Friday, January 29 th , we will have Exam 1, which covers Knight, Chapters 1-4 and my lectures 1-9. Exam 1 will have assigned seating . Exam 1 is closed-book, but you may bring with you one page of notes on a 8½x11” sheet of paper with your name on it and should turn it in with your exam. Bring a Scantron sheet and a scientific calculator with good batteries. Exam 1 will have a multiple-choice section and a free-response section based on lecture example problems and end-of-chapter homework problems in Knight. Exam 1

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Week Date L# Lecture topic Text reading HW 1 4-Jan 1 Description of course structure, SI units 6-Jan 2 Motion, position, velocity, acceleration 1.1-8 (26 P) HW#0 8-Jan 3 One-dimensional motion 2.1-3 (14 P) 2 11-Jan F1 Furlough (Constant acceleration -Tutorial)   13-Jan 4 Vectors 3.1-4 (13 P) HW#1   15-Jan 5 Constant acceleration 2.4-7 (14 P)   3 18-Jan H1 Holiday (Martin Luther King's Birthday)   20-Jan 6 Two- dimensional motion 4.1-3 (12 P) HW#2   22-Jan 7 Circular and relative motion 4.3-7 (14 P) 4 25-Jan 8 Force, mass, inertial frames 27-Jan 9 Newton’s first & second Law HW#3 29-Jan E1 EXAM 1- Chapters 1-4 Oct 24, 2010 Physics 131 - Lecture 7 Lecture Schedule We are here! 4
Oct 24, 2010 Physics 131 - Lecture 7 Centripetal Acceleration 2 (centripetal acceleration) c v a r = 2 (tangential velocity) t r v T π = 5

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Oct 24, 2010 Physics 131 - Lecture 7 A satellite moves at constant speed in a circular orbit about the center of the Earth and near the surface of the Earth. If the magnitude of its acceleration is g = 9.81 m/s 2 , find: (a) its speed; and (b) the time required for one complete revolution. Example: A Satellite’s Motion 2 (centripetal acceleration) c v a r = 2 (tangential velocity) t r v T π = v = rg T = 2 pr v t 6 http://phet.colorado.edu/simulations/sims.p hp?sim=Ladybug_Revolution
Oct 24, 2010 Physics 131 - Lecture 7 Global Positioning System (GPS) Twenty four GPS satellites orbit the Earth at about 11,000 miles (17,000 km) altitude, in obits such that at any place and time 3 or more satellites are in the sky, broadcasting ID and orbit information and time signals accurate to a millionth of a second. Distance to each satellite is calculated from the transit -time delay relative to the clock in the GPS receiver, and position can then be determine the position on the surface of the Earth to an accuracy of 6 meters or better. If a 4 th satellite is above the horizon, altitude can also be calculated. By repeatedly calculating position points, velocity vectors can also be calculated. Good receivers can extrapolate position estimates using “dead reckoning”, i.e. assuming constant velocity, during signal loss periods.

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Physics131_L08WI10 - Physics 131 Mechanics Le cture8...

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