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Physics 11 Online
OpenStudy (anonymous):

Zorch, an archenemy of Superman, decides to slow Earth’s rotation to once per 29.5 h by exerting a force parallel to the equator, opposing the rotation. Superman is not immediately concerned, because he knows Zorch can only exert a force of 4.1 × 107 N. How long, in seconds, must Zorch push with this force to accomplish his goal? (This period gives Superman time to devote to other villains.)

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