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Unformatted text preview: March 7, 2008 PHY2053 Discussion Quiz 7 (Chapter 7.1 -7.6) Name: UFID: *1. (5 pts) A dentists drill starts from rest. After 3.00 s of constant angular acceleration, it turns at a rate of 2.00 10&#3; rev/min. Determine the angle (in radians) through which the drill rotates during this period. 2.00 10&#3; rev/min = 2.00 10&#3; 2 3.14(rad/rev) 1/60(min/sec) = 2.09 10 rad/s The total angular displacement is given by the average velocity times time interval: = av t = (2.09/2) 3 = 3.14 10 rad **2. (5 pts) A car rounds a banked curve where the radius of curvature of the road is 80 m, the banking angle is 15 and the coefficient of static friction is 0.2. Determine the minimum speed the car can have without slipping down the road. We take positive x-axis toward the center of the circle and y-axis vertically up. Applying We take positive x-axis toward the center of the circle and y-axis vertically up....
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