No information is given in the statement of the problem; so we must look up pertinent data before we can calculate L = Iω. First, according to Figure 10.11. the formula for the moment of inertia of a sphere is

Earth's mass M is 5.979 x 10²⁴ kg and its radius R is 6.376 x 10⁶ m. The Earth's angular velocity is, of course, exactly one revolution per day, but we must covert to radians per second to do the calculation in SI units.

Data given in Figure 10.11

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so that L I 2MR² 5 = Io = 2MR² w 5 10.91 10.92