chap8 - CHAPTER 8 ROTATIONAL KINEMATICS ANSWERS TO FOCUS ON CONCEPTS QUESTIONS 1(d Using Equation 8.1 = Arc length Radius to calculate the angle(in

# chap8 - CHAPTER 8 ROTATIONAL KINEMATICS ANSWERS TO FOCUS ON...

This preview shows page 1 - 3 out of 8 pages. Chapter 8 Answers to Focus on Concepts Questions 379 11. 367 rad/s 2 12. (e) According to Newton’s second law, the centripetal force is given by c c F ma , where m is the mass of the ball and a c is the centripetal acceleration. The centripetal acceleration is given by Equation 8.11 as a c = r 2 , where r is the radius and is the angular speed. Therefore, 2 c F mr , and the centripetal force is proportional to the radius when the mass and the angular speed are fixed, as they are in this problem. As a result, c 33 cm 1.7 N 12 cm F . 13. (d) Since the angular speed is constant, the angular acceleration is zero, according to Equation 8.4. Since = 0 rad/s 2 , the tangential acceleration a T is zero, according to Equation 8.10. The centripetal acceleration a c , however, is not zero, since it is proportional to the square of the angular speed, according to Equation 8.11, and the angular speed is not zero.  #### You've reached the end of your free preview.

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• Spring '08
• CROFT
• Physics, Rotation, Angular velocity, Velocity
• • • 