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Homework No. 13 Work and power in rotation Y&F10.32Ans: (a) 46.2 rad/s2(b) 53.9 rad/s (c) 61.3 kJ (d) 52.6 kW (e) 105 kW Note: Treat the propeller as a slender rod pivoted at its center. O R= 0.4 mL= 0.6 mEnergy equation including rigid body rotation CHANG1An 8 Kg slender rod and a small 4 Kg sphere are mounted on a 15 Kg disk. The assembly is released from rest at the horizontal position shown. Find the angular velocity of the assembly when it rotates 90° down to the vertical position. Ans: 5.11 rad/s CHANG2The 10 Kg block is attached to a spring (k = 100 N/m) and a cord that wraps around the pulley as shown. The block slides on the tabletop (μ= 0.4) as a constant torque τ= 25 Nm is applied to turn the pulley from rest. The pulley (radius R= 0.1 m, moment of inertia I= 0.24 Kgm2) is pivoted at the center and the spring is initially unstretched. Finkd the
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