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Physics114A_L16 - Lecture 16(Walker Ch 7.1-2 Work Energy...

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February 5, 2009 Physics 114A - Lecture 16 1/28 Physics 114C - Mechanics Lecture 16 (Walker: Ch. 7.1-2) Work & Energy February 5, 2009 John G. Cramer Professor of Physics B451 PAB [email protected]
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February 5, 2009 Physics 114A - Lecture 16 2/28 Announcements HW4 is dueat 11:59 PM on Thursday, February 5 (Tonight!). Homework up to 24 hours latewill receive70% credit. As of today 181/205 clickers areregistered. Recent clicker scores as of Monday (25 max) areposted on Tycho under “LectureScore2”. My officehours are12:30-1:20 PM on Tuesdays and 2:30-3:20 PM on Thursdays, both in the“114” area of thePhysics Study Center on theMezzaninefloor of PAB C (this building). C.L.U.E. (UW Center for Learning & UndergraduateEducation) will providea review session for Physics 114 Exam2 on Thursday, February 5, in Mary Gates Hall from7:30-9:30 PM. (That’s rather early, considering that Exam2 is on Friday of thefollowing week.)
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February 5, 2009 Physics 114A - Lecture 16 3/28 Physics 114A - Introduction to Mechanics Lecture: Professor John G. Cramer Textbook: Physics, Vol. 1 (UW Edition), James S. Walker Week Date L# Lecture Topic Pages Slides Reading HW Due Lab 4 26-Jan-09 10 Newton's Laws 14 29 5-1 to 5-4 1-D Dynamics 27-Jan-09 11 Common Forces 11 31 5-5 to 5-7 29-Jan-09 12 Free Body Diagrams - 24 - HW3 30-Jan-09 13 Friction 9 29 6-1 5 2-Feb-09 14 Strings & Springs 12 26 6-2 to 6-4 Newton's Laws Tension 3-Feb-09 15 Circular Motion 5 30 6-5 5-Feb-09 16 Work & Energy 11 28 7-1 to 7-2 HW4 6-Feb-09 17 Work & Power 7 25 7-3 to 7-4 6 Work-energy 10-Feb-09 19 Energy Conservation I 16 18 8-3 to 8-5 12-Feb-09 R2 Review & Extension - 44 - HW5 13-Feb-09 E2 EXAM 2 - Chapters 5-8 7 16-Feb-09 H2 Presidents Day Holiday Mom. & Collisions 17-Feb-09 20 Momentum & Impulse 8 23 9-1 to 9-3 19-Feb-09 21 Momentum Conservation 11 24 9-4 to 9-5 HW6 20-Feb-09 22 Collisions & CM 10 22 9-6 to 9-7 Lecture Schedule (Part 2) We are here.
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February 5, 2009 Physics 114A - Lecture 16 4/28 A satellitemoves at constant speed in a circular orbit about the center of theEarth and near thesurfaceof theEarth. If the magnitudeof its acceleration is g = 9.81 m/s 2 and theEarth’s radius is 6,370 km, find: (a) its speed v ; and (b) thetime T required for onecomplete revolution. Example: A Satellite’s Motion 2 cp v a g r = = 3 2 3 (6,370 10 m)(9.81 m/s ) 7.91 10 m/s 17,700 mi/h v rg = = × = × = 3 3 2 / 2 (6,370 10 m) /(7.91 10 m/s) 5,060 s 84.3 min T r v π π = = × × = =
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February 5, 2009 Physics 114A - Lecture 16 5/28 Circular Orbits (1) Thought Experiment: On an airless planet, cannon balls areshot from a cannon mounted on a tower ar increasing muzzlevelocities, and go farther and farther as the velocity is increased.
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