#1
Came across an interesting problem that I can't solve (trying to teach myself some physics). I'd appreciate it if anyone has an idea!

Suppose that you're lying down on a beach watching the sun set. You start a stopwatch just as the top of the sun disappears. You stand up, elevating your eyes by a height H of 1.7 m, and stop the watch when the sun disappears again. The elapsed time is 11.1s. What is the radius r of the earth?
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#2
Ask the new Physics thread?
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#4
It's very imprecise because that's a terrible way to measure it.
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#5
smb, it's not simple trig, although I did figure it out myself. Cheers.
Fender Tele
Breedlove SM20
Cort M800

Peavey Classic 30
Roland Microcube

Digitech RP250
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#8
Well, the formula would be

You would have to find the distance somehow

The earth rotates at 15º angle per hour.
After 11,1 seconds pass, the earth would rotate 0,046º (or the sun is 0,046º up in the horizon when you stand up).
Does the problem even give the latutud/time of the year?