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Question 1:

What is the condition for an object to be in static equilibrium?

A) The object is at rest.
B) The object is in motion with constant velocity.
C) The net force acting on the object is zero.
D) The object experiences no forces.

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Explanation: The correct answer is C) The net force acting on the object is zero. An object is in static equilibrium when the vector sum of all the forces acting on it is zero. This means the object is not accelerating and is either at rest or moving with a constant velocity.

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Question 2:

What is the condition for an object to be in rotational equilibrium?

A) The object is at rest.
B) The object is in motion with constant angular velocity.
C) The net torque acting on the object is zero.
D) The object experiences no rotational motion.

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Explanation: The correct answer is C) The net torque acting on the object is zero. An object is in rotational equilibrium when the vector sum of all the torques acting on it is zero. This means the object is not rotating or is rotating with a constant angular velocity.

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Question 3:

What is the resultant force when an object is in equilibrium?

A) The resultant force is zero.
B) The resultant force is nonzero.
C) The resultant force depends on the object's mass.
D) The resultant force depends on the object's velocity.

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Explanation: The correct answer is A) The resultant force is zero. When an object is in equilibrium, the vector sum of all the forces acting on it is zero. This means the resultant force is zero, indicating a balance between the applied forces.

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Question 4:

What is the torque exerted by the weight of an object in equilibrium?

A) The torque is zero.
B) The torque is nonzero.
C) The torque depends on the object's mass.
D) The torque depends on the object's velocity.

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Explanation: The correct answer is A) The torque is zero. When an object is in equilibrium, the net torque acting on it is zero. The torque exerted by the weight of the object is balanced by an equal and opposite torque, resulting in a net torque of zero.

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Question 5:

What can be said about the center of mass of an object in equilibrium?

A) The center of mass is fixed.
B) The center of mass is moving with a constant velocity.
C) The center of mass is accelerating.
D) The center of mass depends on the object's shape.

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Explanation: The correct answer is A) The center of mass is fixed. The center of mass of an object in equilibrium remains at a fixed position, regardless of the forces acting on the object. It represents the average position of the mass distribution in the object and behaves as if all the mass of the object is concentrated at that point.