Questions 18-20 A disk of radius R = 3.0m rotates with an angular velocity w = (1.6+1.2t) rad/s, where t is in seconds. At the instant t = 2.0s, 18. Find the angular acceleration. (a) a 1.2 rad/s² (b) a = 2.0 rad/s² (c) a = 0.0 rad/s² (d) a = 0.2 rad/s² (e) a = 4.0 rad/s2 (d) v = 21 m/s (e) v = 1.2 m/s 19. Find the speed v for a point on the edge of the disk. (a) v12m/s (b) v = 0.12 m/s (c) v = 2.1 m/s 20. Find the components of the acceleration a of a point on the edge of the disk. (a) atan = 3.6 m/s², aR = 48 m/s² (b) atan (c) atan = 3.6 m/s², aR = 24 m/s² 1.8 m/s², aR = 48 m/s² (d) atan = 0m/s² , aR = 0 m/s² (e) atan = 5.4 m/s², aR = 72 m/s²

Questions 18-20 A disk of radius R = 3.0m rotates with an angular velocity w = (1.6+1.2t) rad/s, where t is in seconds. At the instant t = 2.0s, 18. Find the angular acceleration. (a) a 1.2 rad/s² (b) a = 2.0 rad/s² (c) a = 0.0 rad/s² (d) a = 0.2 rad/s² (e) a = 4.0 rad/s2 (d) v = 21 m/s (e) v = 1.2 m/s 19. Find the speed v for a point on the edge of the disk. (a) v12m/s (b) v = 0.12 m/s (c) v = 2.1 m/s 20. Find the components of the acceleration a of a point on the edge of the disk. (a) atan = 3.6 m/s², aR = 48 m/s² (b) atan (c) atan = 3.6 m/s², aR = 24 m/s² 1.8 m/s², aR = 48 m/s² (d) atan = 0m/s² , aR = 0 m/s² (e) atan = 5.4 m/s², aR = 72 m/s²