Imagine that the standard kilogram is placed on the equator of a planet, where it moves on a circle of radius 5.81 x 106 m (the planet's radius) at a constant speed of 494 m/s due to the planet's rotation. (a) What is the magnitude of the centripetal force on the standard kilogram during the rotation? Imagine that the standard kilogram hangs from a spring balance at that location and assume that it would weigh exactly 11.1 N if the planet did not rotate. (b) What is the reading on the spring balance; that is, what is the magnitude of the force on the spring balance from the standard kilogram?

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