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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 the Sun disappears. You then stand, elevating your eyes by a height of 1.70m, and stop the watch when the top of the Sun again disappears. If the elapsed time is t= 11.1s, what is the radius r of Earth?
A standard interior staircase has steps each with a rise (height) of 19cm, and a run (horizontal depth) of 23cm. For a particular staircase of total height 4.47m, how much farther into the room would the staircase extend if this change in run were made?