A volleyball player spikes the ball. At the instant that she begins to extend her shoulder to bring her arm forward, her shoulder is in 225° of flexion. She contacts the ball 120 ms later with her shoulder in 160° of flexion and extending at 700°/s. 100 ms later, at the end of her follow through, her shoulder stops extending at a flexion angle of 135°.  (i) What was the average angular acceleration at the shoulder before ball contact  (ii) What was the average angular acceleration at the shoulder after ball contact? [Assume extending = negative and flexing = positive]

(2) The slender pole AB slides on the surface of the half-cylinder as its lower end A is pulled to the right on the floor with a constant velocity v = 0.5 m/s. If the radius of the half-cylinder is r = 0.2 m, determine the angular acceleration of the pole when x = 0.6 m. Ans: 0.522 rad/sec² CW A

MY NOTES ASK A car initially traveling at 24.2 m/s undergoes a constant negative acceleration of magnitude 1.70 m/s after its brakes are applied. (a) How many revolutions does each tire make before the car comes to a stop, assuming the car does not skid and the tires have radii of 0.345 m? X rev (b) What is the angular speed of the wheels when the car has traveled half the total distance? X rad/s Submit Answer 10. [2/2 Points] DETAILS PREVIOUS ANSWERS SERCP11 7.4.P.020. MY NOTES ASK YC Human centrifuges are used to train military pilots and astronauts in preparation for hiigh-g maneuvers. A trained, fit person wearing a g-suit can withstand accelerations up (88.2 m/s) without losing consciousness.

(a) What is the tangential acceleration of a bug on the rim of a 5.0 in. diameter disk if the disk moves from rest to an angular speed of 76 rev/min in 5.0 s? |m/s2 (b) When the disk is at its final speed, what is the tangential velocity of the bug? m/s (c) One second after the bug starts from rest, what is its tangential acceleration? ]m/s? What is its centripetal acceleration? m/s? What is its total acceleration? |m/s² ° (relative to the tangential acceleration)

16) Angular acceleration can be produced by: (a) Power (b) Torque (c) Pressure (d) 17) The minute hand of a large clock is 3.0 m long. What is its mean angular speed? (a) 1.4 x 10 rads- (b) 1.7 x 103 rads" (c) 5.2 x 103 rads" 18) In vertical circle, the minimum speed of the body at highest point is (a) v = √2gr (b) v = √3gr (c) √5gr 500 Kgm² 19) Moment of Inertia of 100 Kg sphere having radius 50 cm will be (a) 10 Kgm² (b) 5 Kgm² (c) Temperature (d) 1.0 x 10-1 rads-1 (d) 13 = = √gr (d) 2.5 Kgm² 20) A body rotates with a constant angular velocity of 100 rad/sec about a vertical axis. The torque (a) required to sustain this motion will be Zero Nm (b) 21) Torque acting on body determines its (a) Linear acceleration (b) 22) Force and torque are analogue of force (a) (b) Acceleration (c) Each other 23) An elevator moving upward such that it moves with accelerationa=2g, what will be the real weight of a 100 Nm (c) 200 Nm (d) 300 Nm Impulse (c) Angular Acceleration (d) Linear Momentum…

4) A uniform 135-gram meter stick (length of 1 meter) rotates about an axis perpendicular to the stick passing through its center with an angular speed of 3.50 rad/s. What is the magnitude of the angular momentum of the stick?