L7_phys131_3oct07

# L7_phys131_3oct07 - θ θ θ = θ θ + θ-= = θ + θ-= θ...

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New office hours for all instructors Name Day Hour Room Albert Lee Tuesday 2:30 to 3:30 PM MP1008 Hayes Merritt Tuesday 3:30 to 4:30 PM MP1005 Austen Rau Tuesday 2:30 to 3:30 PM BO 0317 James Stapleton Tuesday 3:30 to 4:30 PM MP1021 Yi Yang Tuesday 2:30 to 3:30 PM SM2186 Bill Reay Tuesday 4:30 to 5:30 PM PRB1010 Wednesday 4:30 to 5:30 PM PRB1010 Some of you may not be able to attend the office hour of your particular instructor. Don’t worry, you are free to attend the office hours of anyone on the list. We are all here to help you. If you have difficulty with anything, get help right away. Otherwise the difficulty will propagate, since everything that you will learn tends to depend on material that came before.

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Review of Lecture 7 On October 3, 2007 Moving in a circle requires acceleration r v θ y x ( 29 ( 29 [ ] ( 29 ( 29 [ ] ( 29 ( 29 ( 29 j ˆ sin i ˆ cos r v a v r 1 dt d dt d d sin d dt sin d j ˆ dt cos d i ˆ dt sin d v dt v d a j ˆ cos i ˆ sin v v j ˆ cos i ˆ sin r r 2 θ + θ - = = θ
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Unformatted text preview: θ θ θ = θ θ + θ-= = θ + θ-= θ + θ = The acceleration points opposite to r, toward center of circle, and has magnitude v 2 /r. Manned space probe problem. We didn’t do this but you can use it as an example The men inside a space probe can withstand 5g on a steady basis. What is the minimum turning radius if the probe is traveling at 1% of the speed of light? ( 29 ( 29 ( 29 m 10 8 . 1 r s m 8 . 9 5 s m 10 3 g 5 v r g 5 r v s m 10 3 100 s m 10 3 v 11 2 6 2 2 6 8 × = × = = = × = × = For comparison, the earth-to-sun distance is 1.5 x 10 11 m...
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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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L7_phys131_3oct07 - θ θ θ = θ θ + θ-= = θ + θ-= θ...

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