P01-02

# P01-02 - Strategy Divide the distance by the speed of light...

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P01.02 Neptune signal travel (25.16) When the Voyager I and Voyager II spacecraft were exploring the outer planets, NASA flight controllers had to plan the crafts' moves well in advance. How many seconds elapse between the time a command is sent from Earth and the time the command is received by Voyager at Neptune? Assume the distance from Earth to Neptune is 4.5E+12 m. Picture of the problem: Radio signal travel from Earth to a distant spacecraft.
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Unformatted text preview: Strategy: Divide the distance by the speed of light to calculate the time for the signal to reach the craft. Solution: Calculate the time: 12 8 4 4.5 10 m 3.00 10 m/s 1.5 10 s d t c × = = × = × Insight: This time delay is 4 hours and 10 minutes. When NASA sends a signal to the craft it takes 8 hours and 20 minutes for NASA to receive a confirmation from the satellite....
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