A rod is to move at constant speed v along the x axis of reference frame S, with the rod's length parallel to that axis. An observer in frame S is to measure the length L of the rod. Which of the curves in the figure best gives length L (vertical axis of the graph) versus speed parameter B? d 0.2 0.4 0.6 0.8 B O a Ob O c o d O e(Come) back to the future. Suppose that a father is 24.00 y older than his daughter. He wants to travel outward from Earth for 1.000 y and then back to Earth for another 1.000 y (both intervals as he measures them) such that he is then 24.00 y younger than his daughter.What constant speed parameter ,8 (relative to Earth) is required for the trip? Number n Units v The gure shows two clocks in stationary frame 5 (they are synchronized in that frame) and one clock in moving frame 5' . Clocks C1 and C1' read zero when they pass each other. When clocks Cl' and C2 pass each other, (a) which clock has the smaller reading and (b) which clock measures a proper time? (a) clock with smaller reading v (b) clock measures proper time v