L13_phys131_17oct07

# L13_phys131_17oct07 - = = = = = = = =-= The midterm &...

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Summary for Lecture 13 on October 17, 2007 = 2 2 1 g r m Gm F The vector gravitational force between two masses is attractive and on a line between the two masses. Because of its 1/r 2 form, the force due to any spherical mass (if the second mass is outside the sphere), is given by assuming that all of the sphere’s mass is concentrated in a point at its center. m 1 m 2 F 12 F 21

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Satellite motion For a satellite moving in a circular path around the earth, the gravitational force is the central attraction needed to keep the satellite moving in a circle. = = r GM v r v m r m GM E 2 s 2 s E r v
Airplane Problem : A plane traveling at 80m/s banks at 60 0 in order to circle over Columbus. What is the radius of the circle, and how many g’s does the pilot experience? 60 0 30 0 R N mg ( 29 ( 29 ( 29 ( 29 m 377 732 . 1 s / m 8 . 9 s / m 80 60 tan g v R mg R mv 60 cos N 60 sin N : equation y by equation x Divide R mv ma 60 sin N F . speed s ' airplane of t independen s ' g 2 pulls Pilot mg 2 60 cos mg N 0 ma mg 60 cos N F 2 2 0 2 2 0 0 2 x 0 x 0 y 0 y = = =

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Unformatted text preview: = = = = = = = =-= The midterm & help (posted in lecture 14 summary) The midterm is 150 points, & includes 10 conceptual questions (similar to clicker questions) worth a total of 50 points and 5 show-work problems worth 100 points. Prof. Schumacher and I believe that it is of medium difficulty. Exam material to review includes: HRW chapters 1 through 6 and the assigned part of 13. Online homework 1 through 5. All labs through this weeks labs. Groupwork problems. Associated clicker questions. Sample midterm (on Carmen) In addition to appointments Ill be available as follows: My office (PRB1010) 4:30 to 5:30 PM Mon., Tues. & Wed. Help session in Dreese 113, 6 to 7:30 PM Tues....
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## This note was uploaded on 04/09/2008 for the course PHYS 131 taught by Professor Reay during the Fall '08 term at Ohio State.

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L13_phys131_17oct07 - = = = = = = = =-= The midterm &...

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