10. [-/2 Points] DETAILS MY NOTES SERPSE10 38.A.0P.033. ASK YOUR TEACHER PRACTICE ANOTHER A 1,400 kg stationary object is hit by a 990 kg object traveling at a speed of 0.800c. If the two objects stick together, determine the following. (a) speed of the composite object immediately after the collision (expressed as a multiple of the speed of light) |e (b} mass (in kg) of the composite object immediately after the collision J ks Need Help? 11. [-/2 Points] SERPSE10 38.A.0P.035.MI. ASK YOUR TEACHER PRACTICE ANOTHER The cosmic rays of highest energy are protons that have kinetic energy on the order of 1013 MeV. (a) As measured in the proton's frame, what time interval would a proton of this energy require to travel across a galaxy which has a proper diameter 1,18 x 10 ly? (Assume the kinetic energy of the proton is exactly 1013 Me\\.) | s (b) From the point of view of the proton, how many kilometers across is the galaxy? | [ km Need Help? Submit Answer 12. [-/4 Points] DETAILS MY NOTES SERPSE10 38.A.0P.036.MI. [ ASK YOUR TEACHER ][ PRACTICE ANOTHER ] Spacecraft I, containing students taking a physics exam, approaches the Earth with a speed of 0.680c (relative to the Earth), while spacecraft II, containing professors proctoring the exam, moves at 0.220c (relative to the Earth) directly toward the students. The professors stop the exam after 48.0 min have passed on their clock. (a) For what time interval (in minutes) does the exam last as measured by the students? min (b) For what time interval (in minutes) does the exam last as measured by an observer on Earth? | min What If? Suppose one of the professors proctored the exam by traveling on spacecraft [ and stopped the exam after 48.0 min elapsed on her clock. (c) For what time interval (in minutes) does the exam last as measured by the professors on spacecraft 117 - min (d) For what time interval (in minutes) does the exam last as measured by an observer on Earth? | min Need Help? | Mastert_|