An astronomer at the equator measures the doppler shift of, Ask an Expert

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An astronomer at the equator measures the Doppler shift of sunlight at sunset. From this, she find outs that Earth's tangential velocity at the equator is 465 m/s. The centripetal acceleration at the equator is 3.41 × 10-2 m/s2. Use this data to find out Earth's radius.

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