What principle describes why a person spins faster with his/her arms in than with his/her arms extended? a.rotational kinematics b.torque c.rotational inertia d.conservation of rotational energy e.conservation of angular momentum

A small mass sits on a turntable at a distance of .347 m from the center of the turntable. The small mass has a tangential acceleration of 1.54 m/s^2. What happens to the angular acceleration of the mass? Choices: A. Is indipendent of the radial position of the mass on the turntable. B. Equals zero C. Depends upon the material being used D. Is greater for a smaller radial position of the mass on the turntable. E. Is greater for a larger radial position of the mass on the turntable.

The figure shows a book and three axes on which the book can rotate. On which axis is the moment of inertia the smallest? A. On axis a. B. The moment of inertia is the same for all three axes. C. On axis b. D. On axis c.

Multiple choice: “Corking” a baseball bat is an attempt to reduce its mass and therefore reduce its: A. angular velocity B. rotational torque C. rotational inertia D. angular acceleration

Rotational motion and momentum:a. A ladybug sits halfway between the rotational axis and the outer edge of the turntable table. The ladybug has a tangential speed of in 0.9 m/s, what will be tangential speed of her friend who sits at the outer edge? b.You lift the child by using your elbow joint (pivot point). If the child's mass is B kg and distance from child to elbow joint is 0.40 m, calculate the torque? C.A ball slides with initial velocity 0.9 m/s on a frictionless surface and collides with another identical ball of mass at rest. The balls stick together after the collision. Calculate the final velocity of the balls?

A frisbee is moving through the air with a constant angular velocity of 10 cycles/s and a constant center of mass velocity of 20 m/s. Which of the following statements is true.   a. The frisbee is not in rotational equilbrium.   b. The frisbee is in total equilibrium.   c. The frisbee is not in translational equilibrium, and it is not in rotational equilibirum.   d. The frisbee is not in translational equilibrium.   e. The frisbee is in translational equilibrium, but it is not in rotational equilibirum.

5. A6 ft board with mass of 2 kg is horizontal and attached to a swivel on one side,the other is allowed to fall from rest. (One side of the board will fall| while the other stays fastened..)

3. A rowing machine consists of a solid disk with a radius of 20-cm and a mass of 19-kg. An athlete pulls on the attached cable with a force of 10-Newtons and causes the disk to accelerate. If the disk starts from rest, determine; a. The disk's moment of inertia. b. The magnitude of the torque applied by the athlete. C. The disk's angular acceleration. d. The disk's angular momentum at t = 5.0 sec.

A constant net torque is applied to an object. Which one of the following will NOT be constant? A. All the above are constant B. Angular acceleration C. Moment of inertia D. Center of gravity E. Angular velocity

A force F is applied perpendicular to a rod at a distance l away from the axis of rotation. Which of the following is TRUE about the torque on the rod? Explain why.A. Torque is parallel to force FB. The longer the lever arm, the smaller the torque. C. When the magnitude of F is doubled, the torque is halved. D. Torque is perpendicular to the lever arm