Physics
Vectors and Equilibrium
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#17 The unit of torque in the SI system is:
A) Joule
B) Newton
C) Watt
D) Newton-meter
#18 The first condition of equilibrium states that:
A) The sum of all forces is zero
B) The sum of all torques is zero
C) The object is at rest
D) The object is moving at constant velocity
#19 The second condition of equilibrium states that:
A) The sum of all forces is zero
B) The sum of all torques is zero
C) The object is at rest
D) The object is moving with acceleration
#20 A body is in complete equilibrium if it satisfies:
A) The first condition only
B) The second condition only
C) Both first and second conditions
D) None of these
#21 The cross product $\hat{i} \times \hat{j}$ is equal to:
A) 0
B) 1
C) $\hat{k}$
D) $-\hat{k}$
#22 The scalar product of two vectors is commutative, meaning:
A) $\vec{A} \cdot \vec{B} = -\vec{B} \cdot \vec{A}$
B) $\vec{A} \cdot \vec{B} = \vec{B} \cdot \vec{A}$
C) $\vec{A} \times \vec{B} = \vec{B} \times \vec{A}$
D) $\vec{A} + \vec{B} = \vec{B} + \vec{A}$
#23 The vector product of two vectors is anti-commutative, meaning:
A) $\vec{A} \times \vec{B} = \vec{B} \times \vec{A}$
B) $\vec{A} \times \vec{B} = -\vec{B} \times \vec{A}$
C) $\vec{A} \cdot \vec{B} = \vec{B} \cdot \vec{A}$
D) $\vec{A} \cdot \vec{B} = -\vec{B} \cdot \vec{A}$
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