1-if a person's line of vision is at the top of Building 121 feet high, how far out to sea could a person see with a good telescope?
2- the light in a lighthouse is 144 feet above sea level. How far does the light extend before it dips below sea level?
3- if an observer is on a tower 144 meters high, how many kilometers out to sea, could a surfer be observed, using a powerful telescope?
There is more of Those kind questions.. Can anyone pleas give me a website that just i put the number and find out the solution.. Or give me the formal by answering these questions?
The formula in feet and miles is the square root of 1.5 x 121 feet. So -- your first answer is 13.47 miles. Check this site for more information and the formula for figuring the distance in meters and kilometers.
http://en.wikipedia.org/wiki/Horizon
from where did u get, and how 1.5
I found the formula in the web site I posted.
6 answers