3. A force is applied to a disk as shown below. If the disk starts from rest, what will be its angular speed after 1 second? 0.5 m 2N (A) 0 rad/s (B) 1 rad/s (C) 4 rad/s (D) It cannot be determined without knowing the rotational inertia of the disk.
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- A dentist's drill starts from rest. After 3.40 s of constant angular acceleration it turns at a rate of 2.30 x 10 rev/min. (a) Find the drill's angular acceleration. rad/s2 (b) Determine the angle (in radians) through which the drill rotates during this period. radA dentist's drill starts from rest. After 3.50 s of constant angular acceleration it turns at a rate of 2.30 x 104 rev/min. (a) Find the drill's angular acceleration. rad/s2 (b) Determine the angle (in radians) through which the drill rotates during this period. radA tire is being tested and the machine has it rotating with an angular speed of 0.691 rad/ (CW). An angular acceleration is applied to the tire and after a period of 4.30 s, an angle of 12.7 rad (CW) has been turned through. What is the angular acceleration applied? Select one: a. b. O C. O d. 1.69 rad/2 (CCW) 1.05 rad/52 (CW) 1.69 rad/2 (CW) 1.05 rad/2 (CCW)
- Suppose a disk with constant angular velocity has rotational kinetic energy 1280 J. If the moment of inertia of the disk is 35 kg-m?, then what is its angular velocity? 8.552 rad/s 9.066 rad/s С. 7.303 rad/s 10.07 rad/s 10.40 rad/s А. D. В. E. 10.14 rad/s F.A flywheel (I 49 kg m' 21 starting from rest acquires an angular velocity of 233 rad/s while subject to a constant torque from a motor for 5 s. a. What is the angular acceleration of the flywheel? rad/s? b. What is the magnitude of the torque? N m Question Help: Message instructor Submit Question2 W S X 24919 3 E D C 3. A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.45 x 10¹ rad/s to an angular speed of 3.75 x 104 rad/s. In the process, the bit turns through 2.26 x 10¹ rad. Assuming a constant angular acceleration, how long would it take the bit to reach its maximum speed of 7.10 x 10 rad/s, starting from rest? $ R F V % 5 19 T G tv B MacBook Air 6: Y H & 7 N 44 U ★ 8 J P M ( 9 K MOSISO V H 2 command 4 option y m 04 M
- A 85.0-kg skater begins a spin with an angular speed of 8.00 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one-fourth its initial value. What is the skater's final angular speed? my final answer is 16 rad/s? I'm not sure if it's correct because on test it was marked as incorrect. Can you please explain why it's incorrect?A skater spins about a fixed point on the ice. She begins with her arms extended and an initial angular velocity wo. She then pulls her arms in to her body. After her arms are pulled to her body, she spins with an angular velocity final ,wf . Throughout the time she is spinning, no external forces are acting in the horizontal plane. How do the magnitudes of the initial and final angular velocities compare? OA. Wo > Wf OB. WO = wf w0 < wf OE. ооо оо