ef152-lec-2-4 - Module 2, Lecture 4 Newtons Law of...

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EF 152 Spring, 2009 Lecture 2-4 2 Module 2, Lecture 4 Newton’s Law of Universal Gravitation Hurricane Katrina G = 6.67259x10 -11 N-m 2 /kg 2 What is the force of gravity on a 2000 kg spacecraft when it orbits the earth at one radius of the earth above the earth? (r E = 6378 km; m E = 5.976x10 24 kg) A. Weightless B. 4900 N (1/4 of the weight on the earth) C. 9800 N (1/2 of the weight on the earth) D. 19600 N (weight on the earth) 2 2 1 r m m G F g = (m 3 /(kg-s 2 ) EF 152 Spring, 2009 Lecture 2-4 3 Acceleration Due to Gravity Hurricane Katrina 2 r m G m F m W g E g = = = g varies with location: - - - () () () 2 2 2 1 E E E E E r h r m G h r m G h g + = + = Sears Tower: h = 443m () () () 2 2 2 2 h r r r Gm h r m G g h g E E E E E E + = + = EF 152 Spring, 2009 Lecture 2-4 4 Planets and Satellites Hurricane Katrina () () h r v m h r mm G F E E E g + = + = 2 2 What keeps a satellite up? () h
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This note was uploaded on 04/07/2009 for the course EF 152 taught by Professor Ab during the Spring '08 term at University of Tennessee.

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ef152-lec-2-4 - Module 2, Lecture 4 Newtons Law of...

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