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Thank you but I am wondering about the "r"

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How did you find "r"? 6400? what's that?  Please let me know! :)
related to an answer for: Physics homework. help me?
asked Jul 14, 2014 in PHYSICS by anonymous
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Hi,

Here r  = radius of earth+distance of telscope from surface of the earth

           =6400 km+578 km

           = 6400000+578000

           =6978000 m

answered Jul 14, 2014 by bradely Mentor

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