Posted by **Anonymous** on Wednesday, September 15, 2010 at 8:07pm.

Is there a shorter way to answer this question?

Radio waves ina vacuum travel a distance equal to seven times the circumference of earth in 1 s. If the radius of Earth is 6 318 138.7m, what is the speed of the radio waves in kilometres per hour?

- MATH -
**PsyDAG**, Thursday, September 16, 2010 at 1:32pm
C = 2πr

Mutliply that value by 7 and convert to Km/hour

6,318,138.7m = 6,318.1387Km

3600 seconds = 1 hour

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