EF 152 – Physics for Engineers Spring, 2009 Recitation 1.5 Review Problems 1. Find the torque (moment) about point B. 2. A carousel initially at rest has an angular acceleration of 0.4 rad/s 2 and accelerates for 5 s. It then rotates at a constant angular velocity for 30 s before slowing down at the same rate with which it accelerated. The carousel eventually comes to a stop. How far does a rider sitting on horse 3 m from the center travel during the ride? 3. A bicycle wheel has an angular velocity of 4.5 rad/sec. 14 seconds later, the bicycle wheel has an angular velocity of 7.8 rad/sec. Assuming constant angular acceleration, how many revolutions did the bicycle make in the 14 seconds? 4. A wooden salad bowl can be approximated as follows. The sides can be approximated as a hollow cylinder with an outside radius of 150 mm, an inside radius of 120 mm, a height of 100 mm, and a mass of 1.8 kg. The bottom can be approximated as a disc that fits inside the cylinder with a thickness of 25 mm and a mass of 0.8 kg.
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