This question appeared on Bangladesh physics Olympiad 2014, Sylhet, Bangladesh for students of class 9 and 10.

I really tried to solve this but i failed. Please help.

Suppose that, while lying on the 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, and fitting your eyes by a height $H=1.70\,\mathrm m$, and stop the watch when the top of the sun again disappears. If the elapsed time is $T=574\,\mathrm s$, what is the radius of the Earth?

You can check out the question: http://bdpho.org/pdf/sylhet_cat%20B_2014.pdf The question is on number 7.

This question appeared on Bangladesh physics Olympiad 2014, Sylhet, Bangladesh for students of class 9 and 10.

I really tried to solve this, but I failed. Please help.

Suppose that, while lying on the 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, and fitting your eyes by a height $H=1.70\,\mathrm m$, and stop the watch when the top of the sun again disappears. If the elapsed time is $T=574\,\mathrm s$, what is the radius of the Earth?

You can check out the question: http://bdpho.org/pdf/sylhet_cat%20B_2014.pdf The question is on number 7.

This question appeared on Bangladesh physics Olympiad 2014, Sylhet, Bangladesh for students of class 9 and 10.

I really tried to solve this but i failed. Please help.

Suppose that, while lying on the 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, and fitting your eyes by a height $H=$1.70 metres, and stop the watch when the top of the sun again disappears. If elapsed time $T=$574 seconds, what is the radius of the Earth?

Edit: Sorry i have checked the question and the time is T=574.

You can check out the question: http://bdpho.org/pdf/sylhet_cat%20B_2014.pdf The question is on number 7.

This question appeared on Bangladesh physics Olympiad 2014, Sylhet, Bangladesh for students of class 9 and 10.

I really tried to solve this but i failed. Please help.

Suppose that, while lying on the 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, and fitting your eyes by a height $H=1.70\,\mathrm m$, and stop the watch when the top of the sun again disappears. If the elapsed time is $T=574\,\mathrm s$, what is the radius of the Earth?

You can check out the question: http://bdpho.org/pdf/sylhet_cat%20B_2014.pdf The question is on number 7.