Subject: Physics - Page 2

Ellen is an observer on a spaceship in deep space. Outside her window she can see two small asteroids that are stationary relative to her spaceship, and are both on her x-axis. The closest asteroid is 1.80 × 107 km away, while the second is 3.30 × 107 km away. Ellen observes signal lights on both asteroids appear at the same time, which she notes to be 0 seconds on her clock. She sees both signal lights turn off 56.0 s later. On the spacetime diagram below Ellen’s reference frame is represented by the x and t axes. River sees the same events from her spaceship, which is travelling at a speed of v relative to Ellen’s spaceship. Her reference frame is represented by the x’ and t’ axes on the spacetime diagram below. The divisions on River’s axes are spaced the same as Ellen’s. Critically analyse the information to compare how the events on the two asteroids appear to Ellen and River. In your answer you must include the following information  A completed spacetime diagram showing the events on the two asteroids. You can copy the axes below into your document to complete your diagram.  Determine the relative velocities, v of the two spaceships. You must choose which other values and information to present in your answer. In your answer you should explain how you determined the information presented. Question 2 Marking Rubric A grade (8) B grade (6-7) C grade (4-5) D grade (2-3) E grade (0-1) Critically analyses predictions of special relativity to create insightful solutions, with evidence, to the given problem. Analyses predictions of special relativity to create solutions, with evidence, to the given problem. Explains predictions of special relativity that relate to the given problem. Describes predictions of special relativity that relate to the given problem. Identifies predictions of special relativity that relate to the given problem. x (×10^6 km) t (×c m)