ch10-p029 - 29. (a) Earth makes one rotation per day and 1...

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29. (a) Earth makes one rotation per day and 1 d is (24 h) (3600 s/h) = 8.64 × 10 4 s, so the angular speed of Earth is 5 4 2r a d 7.3 10 rad/s. 8.64 10 s ω π == × × (b) We use v = ω r , where r is the radius of its orbit. A point on Earth at a latitude of 40° moves along a circular path of radius r = R cos 40°, where R is the radius of Earth (6.4 × 10 6 m). Therefore, its speed is
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