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# HW7 - Homework 7 Physics 204 evening summer 2008 Part 1 1...

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Homework 7 Physics 204, evening summer 2008 Part 1 1. The distance from earth to the center of the galaxy is about 23500 ly (1 ly = 1 light year = 9.47 10 15 m), as measured by an earth based observer. A spaceship is to make this journey at a speed of 0.9970 c . According to a clock on board the spaceship, how long will it take to make the trip? Express your answer in years (1 yr = 3.16 10 7 s). 2. A space traveler moving at a speed of 0.59 c with respect to the earth makes a trip to a distant star that is stationary relative to the earth. He measures the length of this trip to be 7.5 light years. What would be the length of this same trip (in light years) as measured by a traveler moving at a speed of 0.83 c with respect to the earth? 3. A person on earth notices a rocket approaching from the right at a speed of 0.78 c and another rocket approaching from the left at 0.60 c . What is the relative speed between the two rockets, as measured by a passenger on one of them?
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