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02_InstSolManual_PDF_Part4 - 2-4 Chapter 2 Solve d 5 vt 5 1...

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2.13. Set Up: The speed of light is Solve: 2.14. Solve: (a) touch: pain: (b) The difference between the two times in (a) is 3.01 s. 2.15. Set Up: The speed of light is Light and sound travel at constant speed so The distance from the earth to the sun is The distance from the earth to the moon is Solve: (a) (b) Light: Sound: (c) (d) (e) 2.16. Set Up: The distance d around a circular path is The radius of the earth is and the earth completes one rotation in 24 h. The radius of the earth’s orbit is and the earth completes one revolution around the sun in Solve: (a) (b) 2.17. Set Up: Use the normal driving time to find the distance. Use this distance to find the time on Friday. Solve: Then on Friday The increase in time is Reflect: A smaller average speed corresponds to a longer travel time when the distance is the same. 2.18. Set Up: Let d be the distance A runs in time t . Then B runs a distance in the same time t . Solve: and Combine these two equations to eliminate d . and Then they will meet 106 m from where A starts.
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