At present, the motion of people on Earth is fairly random; the number moving east equals the number moving west, etc. Assume that we could get all of Earth's inhabitants lined up along the land at the equator.

If they all started running as fast as possible toward the west, estimate the change in the length of a day. Suppose there are 7×109people in the world, with an average mass of 50 kg per person, and they all run toward west at a speed of 1.6 m/s . The mass of Earth is 5.98×1024kg and its radius is 6.37×106m. Assume that Earth is a solid sphere with its mass distributed uniformly.

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