2012 Pearson Education, Inc. Texas AM （2012年皮尔森教育公司,德州农工大学）.pdf

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2012 Pearson Education, Inc. Texas AM （2012年皮尔森教育公司,德州农工大学）.pdf

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2012PearsonEducation,Inc.TexasA

Q9.1 The graph shows the angular velocity and angular acceleration versus time for a rotating body. At which of the following times is the rotation speeding up at the A. t = 1 s greatest rate? B. t = 2 s C. t = 3 s D. t = 4 s E. t = 5 s © 2012 Pearson Education, Inc. A9.1 The graph shows the angular velocity and angular acceleration versus time for a rotating body. At which of the following times is the rotation speeding up at the A. t = 1 s greatest rate? B. t = 2 s C. t = 3 s D. t = 4 s E. t = 5 s © 2012 Pearson Education, Inc. Q9.2 A DVD is initially at rest so that the line PQ on the disc’s surface is along the +x-axis. The disc begins to turn with a constant 2  = 5.0 rad/s . z At t = 0.40 s, what is the angle between the line PQ and the +x-axis? A. 0.40 rad B. 0.80 rad C. 1.0 rad D. 2.0 rad © 2012 Pearson Education, Inc. A9.2 A DVD is initially at rest so that the line PQ on the disc’s surface is along the +x-axis. The disc begins to turn