3_pdfsam_quiz5-6keys

3_pdfsam_quiz5-6keys - Phy63 Spring 2010 QUIZ 6 Name K I...

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Unformatted text preview: Phy63 Spring 2010 QUIZ 6 Name: K%, I Rec: _ x'=7(x~vt) y’=y 1. Siblings A and B are twins. A leaves on a rocket sip from earth, traveling close to the speed of light and returns. Upon his return, he must have aged nearly the same as B, given the fact that there is no preferred inertial frame (1 point): T 6) 2. A spaceship travels at a speed of 0.99 c approaching the moon. An astronaut in the spaceship observes two events on the moon, separated by At = 2 us, and A X = 2.5 km, while moving directly toward the locations with the ﬁrst event occurring at the closer location. What are the time separation (magnitude) and spatial separation in the reference frame of the moon, and can the events be causally related, i.e. one causing the other (c = 3x108 m/s, 2 points)? a. 44.3 tts, 13.5 km; yes causally related 1). 2 as, 2.5 km;yes AX -; X (Ail—t- VA'H) : 9W ism c. 72.7 115,219 km; yes : ‘ f 11 I 3 . At WK (bi: + C'- sx ) 73.7 jig d. 44.3 us, 13.5 km; no L 2.. m .. (a M) > 0 ® 72.7 us, 21.9 km; no ...
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