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 H = 1.70 m, and stop the watch when the top of the Sun again disappears. If the elapsed time is t = 11.1 s, what is the radius r of Earth?

Question

anonymous · Answer

it is resnick's cover page question right?

anonymous · Answer

yeh from the book but dunno about the rtan theta part

anonymous · Answer

i don't see it

anonymous · Answer

u understood the figure?
this problem is mathematical manipulation

anonymous · Answer

d=r tan@
and just substitution in the first pythagoras equation

anonymous · Answer

yeh but why does d=rtan

anonymous · Answer

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