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1.	A force with a given magnitude is to be applied to a wheel. The torque can be maximized by: A. applying the force near the axle, radially outward from the axle B. applying the force near the rim, radially outward from the axle C. applying the force near the axle, parallel to a tangent to the wheel D. applying the force at the rim, tangent to the rim E. applying the force at the rim, at 45◦ to the tangent
Answer» D. applying the force at the rim, tangent to the rim

2.	If the angular velocity vector of a spinning body points out of the page then, when viewed from above the page, the body is spinning: A. clockwise about an axis that is perpendicular to the page B. counterclockwise about an axis that is perpendicular to the page C. about an axis that is parallel to the page D. about an axis that is changing orientation E. about an axis that is getting longer
Answer» B. counterclockwise about an axis that is perpendicular to the page

3.	Two uniform circular disks having the same mass and the same thickness are made from different materials. The disk with the smaller rotational inertia is: A. the one made from the more dense material B. the one made from the less dense material C. neither – both rotational inertia's are the same D. the disk with the larger angular velocity E. the disk with the larger torque
Answer» A. the one made from the more dense material

4.	The magnitude of the acceleration of a point on a spinning wheel is increased by a factor of 4 if: A. the magnitudes of the angular velocity and the angular acceleration are each multiplied by a factor of 4 B. the magnitude of the angular velocity is multiplied by a factor of 4 and the angular acceleration is not changed C. the magnitudes of the angular velocity and the angular acceleration are each multiplied by a factor of 2 D. the magnitude of the angular velocity is multiplied by a factor of 2 and the angular acceleration is not changed E. the magnitude of the angular velocity is multiplied by a factor of 2 and the magnitude of the angular acceleration is multiplied by a factor of 4
Answer» E. the magnitude of the angular velocity is multiplied by a factor of 2 and the magnitude of the angular acceleration is multiplied by a factor of 4

5.	Consider four objects, each having the same mass and the same radius: 1. a solid sphere 2. a hollow sphere 3. a flat disk in the x, y plane 4. a hoop in the x, y plane The order of increasing rotational inertia about an axis through the center of mass and parallel to the z axis is: A. 1, 2, 3, 4 B. 4, 3, 2, 1 C. 1, 3, 2, 4 D. 4, 2, 3, 1 E. 3, 1, 2, 4
Answer» C. 1, 3, 2, 4

6.	The rotational inertia of a wheel about its axle does not depend upon its: A. diameter B. mass C. distribution of mass D. speed of rotation E. material composition
Answer» D. speed of rotation

7.	A block is attached to each end of a rope that passes over a pulley suspended from the ceiling. The blocks do not have the same mass. If the rope does not slip on the pulley, then at any instant after the blocks start moving, the rope: A. pulls on both blocks, but exerts a greater force on the heavier block B. pulls on both blocks, but exerts a greater force on the lighter block C. pulls on both blocks and exerts the same magnitude force on both D. does not pull on either block E. pulls only on the lighter block
Answer» A. pulls on both blocks, but exerts a greater force on the heavier block

8.	A pulley with a radius of 3.0 cm and a rotational inertia of 4.5×10−3 kg · m2 is suspended from the ceiling. A rope passes over it with a 2.0-kg block attached to one end and a 4.0-kg block attached to the other. The rope does not slip on the pulley. At any instant after the blocks start moving, the object with the greatest kinetic energy is: A. the heavier block B. the lighter block C. the pulley D. either block (the two blocks have the same kinetic energy) E. none (all three objects have the same kinetic energy)
Answer» C. the pulley

9.	A disk starts from rest and rotates about a fixed axis, subject to a constant net torque. The work done by the torque during the second revolution is as the work done during the first revolution. A. the same B. twice as much C. half as much D. four times as much E. one-fourth as much
Answer» A. the same

10.	A disk starts from rest and rotates around a fixed axis, subject to a constant net torque. The work done by the torque during the second 5 s is as the work done during the first 5 s. A. the same B. twice as much C. half as much D. four times as much E. one-fourth as much
Answer» D. four times as much

11.	A disk is free to rotate on a fixed axis. A force of given magnitude F, in the plane of the disk, is to be applied. Of the following alternatives the greatest angular acceleration is obtained if the force is: A. applied tangentially halfway between the axis and the rim B. applied tangentially at the rim C. applied radially halfway between the axis and the rim D. applied radially at the rim E. applied at the rim but neither radially nor tangentially
Answer» B. applied tangentially at the rim

12.	A car travels north at constant velocity. It goes over a piece of mud, which sticks to the tire. The initial acceleration of the mud, as it leaves the ground, is: A. vertically upward B. horizontally to the north C. horizontally to the south D. zero E. upward and forward at 45◦ to the horizontal
Answer» A. vertically upward