CHALLENGE PROBLEMS121. The angular acceleration of a rotating rigid bodyis given by a = (2.0 – 3.0t) rad/s². If the body startsrotating from rest at t=0, (a) what is the angularvelocity? (b) Angular position? (c) What angle does itrotate through in 10 s? (d) Where does the vectorperpendicular to the axis of rotation indicating 0° at t = 0lie at t = 10 s?122. Earth's day has increased by 0.002 s in the lastcentury. If this increase in Earth's period is constant, howlong will it take for Earth to come to rest?123. A disk of mass m, radius R, and area A has a surfacemass density o = m (see the following figure). What isARthe moment of inertia of the disk about an axis through thecenter?Axis of rotationopposing foreis not immedonly exert aa Saturn Vwith this forcRotation Mar125. A cordof radius 0.2on the cord scylinder ismoment of intheorem to cafter 5.0 m ofis replaced byof the cylinde

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