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A physics student is studying a globe, which can be approximated as a uniform solid
sphere with a radius of 0.220 m and a mass of 0.800 kg. When turned on its axis, it has a
frictional torque of 0.180 N·m. How much force at the equator does the student have to
exert to bring it from rest to an angular velocity of 0.900 rev/s in 1.20 s?

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