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Q. A constant torque of 23.5 N·m is applied to a grindstone whose moment of inertia is 0.130 kg·m2. Using energy principles, and neglecting friction, find the angular speed after the grindstone has made 12.5 revolutions.

Q. Certain neutron stars (extremely dense stars) a believed to be rotating at about 1 rev/s. If such a star has a radius of 16 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?

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