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Unformatted text preview: July 18, 2008 PHY2053 Discussion Quiz 7 (Chapter 7.1-8.4) Name: UFID: *1. (5pts) A car starts from rest on a circular track with a radius of 400 m. The car accelerates at a constant tangential acceleration of 0.600 m/s 2 . At the point where the magnitudes of the centripetal and tangential accelerations are equal, determine the distance the car has traveled. Equating the centripetal acceleration a c = v/r with the tangential acceleration, we have v/r = a t v = (ra t ) = (400 0.6) = 15.5 m/s. Using the kinematics equation v f = v i +2a t s, the distance is given by s = v f /(2a t) = 15.5/(2 0.6) = 200. m **2. (5pts) In a popular amusement park ride, a rotating cylinder of radius 3.00 m is set in rotation. Then the floor drops away, leaving the riders suspended against the inside in rotation....
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