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Unformatted text preview: Chapter 12: EQUILIBRIUM AND ELASTICITY 1. A net torque applied to a rigid object always tends to produce: A. linear acceleration B. rotational equilibrium C. angular acceleration D. rotational inertia E. none of these ans: C 2. The conditions that the net force and the net torque both vanish: A. hold for every rigid body in equilibrium B. hold only for elastic solid bodies in equilibrium C. hold for every solid body D. are always su cient to calculate the forces on a solid object in equilibrium E. are su cient to calculate the forces on a solid object in equilibrium only if the object is elastic ans: A 3. For an object in equilibrium the net torque acting on it vanishes only if each torque is calculated about: A. the center of mass B. the center of gravity C. the geometrical center D. the point of application of the force E. the same point ans: E 4. For a body to be in equilibrium under the combined action of several forces: A. all the forces must be applied at the same point B. all of the forces form pairs of equal and opposite forces C. the sum of the components of all the forces in any direction must equal zero D. any two of these forces must be balanced by a third force E. the lines of action of all the forces must pass through the center of gravity of the body ans: C 5. For a body to be in equilibrium under the combined action of several forces: A. all the forces must be applied at the same point B. all of the forces form pairs of equal and opposite forces C. any two of these forces must be balanced by a third force D. the sum of the torques about any point must equal zero E. the lines of action of all the forces must pass through the center of gravity of the body ans: D 176 Chapter 12: EQUILIBRIUM AND ELASTICITY 6. To determine if a rigid body is in equilibrium the vector sum of the gravitational forces acting on the particles of the body can be replaced by a single force acting at: A. the center of mass B. the geometrical center C. the center of gravity D. a point on the boundary E. none of the above ans: C 7. The center of gravity coincides with the center of mass: A. always B. never C. if the center of mass is at the geometrical center of the body D. if the acceleration due to gravity is uniform over the body E. if the body has a uniform distribution of mass ans: D 8. The location of which of the following points within an object might depend on the orientation of the object? A. Its center of mass B. Its center of gravity C. Its geometrical center D. Its center of momentum E. None of the above ans: B 9. A cylinder placed so it can roll on a horizontal table top, with its center of gravity above its geometrical center, is: A. in stable equilibrium B. in unstable equilibrium C. in neutral equilibrium D. not in equilibrium E. none of the above ans: B 10. A cylinder placed so it can roll on a horizontal table top, with its center of gravity below its geometrical center, is: A. in stable equilibrium B. in unstable equilibrium C. in neutral equilibriumC....
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 Spring '08
 Halstead
 Acceleration, Force, Inertia, ... ..., a. b. c.

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