1 Suppose that, while lying on a beach near the equator watching the Sun set over a calm ocean, you start a stopwatch just as the top of Sun disappears. You then stand, elevating your eyes by a height h=1.70 m, and stop the watch when the top of the Sun again disappears. The time between two suunsets is approximately 10 sec. We can accordingly find the radius of Earth. a) Show that R = 2h 0 ; 0 is the angle which is swept out by Earth between two sunsets. b) Find 0 in terms of time t. c) Calculate R