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A disk rotates about a fixed axis through its center of mass and perpendicular to the...

A disk rotates about a fixed axis through its center of mass and perpendicular to the disk. It starts from rest and accelerates uniformly, reaching angular speed ωafter 5.14 revolutions. If it continues to accelerated at the same rate, how many more revolutions would it take the disk to reach angular speed 9.6ω rad/s?    

A disk spins at ωo = 63.4 rad/s on an axis through its center of mass. At t = 0 it begins to accelerate at α = 0.233 rad/s2, reaching its final speed after 5.57 seconds. How many times has the disk turned while it was accelerating?

For two uniform solid spheres:

- the ratio of their moments of inertia is I2/I1 = 24.9

- the ratio of their radii is R2/R1 = 5.9.

Find the ratio of their masses, M2/M1.

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