A satellite is in a circular orbit about the Earth at a distance of two Earth radii above the surface. What is the speed of the satellite? (The radius of the Earth is 6.4 × 10^6 m, and G = 6.67 × 10^-11 N × m2/kg2.)

a. 2800 m/s
c. 5600 m/s
b. 4600 m/s
d. 16,800 m/s


B

Physics & Space Science

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If a wave has a frequency of 12 Hz, it has a period of

a. 1/12 s. b. 3.5 s. c. 144 s. d. 12 s.

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Which of the following correctly describes the situation when Jackie returns to Earth? (Ages in this problem refer to biological ages—that is, how much time has passed for each sister since she was born.)

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The most important properties of polymers are their low ______________and their high corrosion resistance. 22. In high-strength

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science