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

The average speed of an orbiting space shuttle is 20100 mi/h. The shuttle is orbiting about 196 mi above the Earth’s surface. Assume the Earth’s radius is 3963 mi.

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

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

- physics -
**tchrwill**, Saturday, June 11, 2011 at 9:43am
Time = 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 12:26am
So 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 5:28am
Yes, 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 8:54pm
I 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

- physics -
**jen**, Wednesday, September 10, 2014 at 7:56pm
78

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