Angie Says That an Object Is in Equilibrium If the Net

question 17

Multiple Choice

Angie says that an object is in equilibrium if the net torques about the center of mass is zero. Robbie says that an object is in equilibrium if the sum of external forces is zero. Which one, if either, is correct?

• A) Both are correct: an object is in equilibrium if either condition holds.
• B) Neither is correct: both conditions must hold simultaneously.
• C) Neither is correct: the net external force and the net external torque about any axis must be zero.
• D) Neither is correct: an object is in equilibrium only if its velocity is zero in all coordinate systems.
• E) Both are correct: if the sum of the external forces is zero, the net torque about any axis is automatically zero, and vice versa.

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Definitions:

Unfair Labor Practices

Actions taken by employers or unions that violate the rights of employees or regulations governing labor relations.

National Labor Relations Act

A foundational US law enacted in 1935 to protect the rights of employees and employers, encouraging collective bargaining and regulating union activities.

Unions

Organizations formed for the purpose of representing their members' interests in dealing with employers.

Collective Bargaining

Negotiation between union representatives and management representatives to arrive at a contract defining conditions of employment for the term of the contract and to administer that contract.