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Physics - Classical Mechanics

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The 1.4 kg, 20 cm diameter disk in Figure P13.69 is spinning at 200 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 4.0 s?

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Physics - Classical Mechanics - Rotational Motion

An astronaut is being tested in a centrifuge. The centrifuge has a radius of 10 m and, in starting, rotates according to theta = (0.30 rad/s?t? where t is in seconds and theta is in radians. When t = 5.0 s, what are the magnitudes of the astronaut's
(a) rotational velocity,
(b) translational velocity,
(c) tangential acceleration,
(d) radial acceleration?

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