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Posted by **ashley** on Saturday, June 11, 2011 at 1:50am.

How long does it take to circle the Earth? Answer in units of h ( hours)

- physics -
**drwls**, Saturday, June 11, 2011 at 3:56amI am not providing further assistance unless you show work. Start by calculating the circumference of the orbit.

- physics -
**tchrwill**, Saturday, June 11, 2011 at 9:43amTime = orbit circumference divided by speed.

It might be of some interest to you is the fact that a spacecraft's orbital speed at 196 miles altitude is

V = sqrt[1.407974x10^16/(3963+196)(5280)] = 25,321fps = 17,265mph.

- physics -
**ashley**, Sunday, June 12, 2011 at 12:26amSo would I take the answer from the formula for a circumference of a circle(24900.26337) and divide it by 17,265 to get 1.442239408(~1.44h)?

How I got the circumference: 2 x pi x 3963=24900.26337

- physics -
**bobpursley**, Sunday, June 12, 2011 at 5:28amYes, that is correct, but I would verify the units. radius is in miles, so circumference is in miles, speed is in miles per hour, so time is in hours.

- physics -
**ashley**, Sunday, June 12, 2011 at 8:54pmI tried 1.44 h, but I got the answer wrong. Can you please tell me what I may be doing incorrectly with the significant figures? thanks

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