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*11.
mmh The
earth moves around the sun in a nearly circular orbit of radius 1.50 x 1011 m. During the three summer months (an elapsed time of 7.89 x 106 s), the earth moves one-fourth of the distance around the sun. (a)
What is the average speed of the earth? (b)
What is the magnitude of the average velocity of the earth during this
period? |
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Average speed would be the
path length divided by time elapsed.
The path length will be one-fourth of a circle so |
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Now the magnitude of the
average velocity is the vector displacement divided by elapsed time. The vector displacement is represented by S
in the diagram and it is the hypotenuse of the right triangle with the other
two sides being radius R. |
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