Quiz07a-s

# Quiz07a-s - Quiz 7a Name Phys224 Date Spring 2010 Dr P...

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Quiz 7a Name: Date: Phys224 Spring 2010 Dr. P. Hanlet Concept (3 points each) 1. As a space traveller, your spacecraft has headlights that allow you to view debris. As you pass something interesting, you decide to switch the lights on behind you to get a better look. If your spacecraft is travelling at 1 3 c relative to the nearest star, at what speed, relative to that same star, will the light be moving? (a) 1 . 0 × 10 8 m/s (b) 3 . 3 × 10 8 m/s (c) 2 . 7 × 10 8 m/s (d) 3 . 0 × 10 8 m/s (e) 2 . 0 × 10 8 m/s 2. In the example given in class in which a ground based observer in the S inertial reference frame watches a train get hit by two simultaneous lightening bolts at the front and rear of the train, which equation would be used to compute the time of the events as seen by a train based observer? (a) Δ t = γ Δ t 0 (b) t = γ parenleftBig t vx c 2 parenrightBig (c) t = γ parenleftbigg t + vx c 2 parenrightbigg (d) Δ t = γ parenleftbigg Δ t v Δ x c 2 parenrightbigg (e) Δ t = γ parenleftbigg Δ t + v Δ x c 2

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