Physics
Vectors and Equilibrium
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#89 The angle between a vector and its negative is:
A) $0^\circ$
B) $90^\circ$
C) $180^\circ$
D) $360^\circ$
#90 The components of a vector $\vec{A}$ are $A_x$ and $A_y$. The vector can be written as:
A) $\vec{A} = A_x + A_y$
B) $\vec{A} = A_x\hat{i} + A_y\hat{j}$
C) $\vec{A} = A_x \hat{i} + A_y$
D) $\vec{A} = A_x \hat{j} + A_y \hat{i}$
#91 The moment of inertia is an analogue of:
A) Force
B) Mass
C) Momentum
D) Velocity
#92 The SI unit of force is Newton (N), which is equivalent to:
A) $kg \cdot m/s$
B) $kg \cdot m/s^2$
C) $kg \cdot m^2/s$
D) $kg \cdot m/s^3$
#93 A vector that gives the position of a point with respect to the origin is called:
A) Displacement vector
B) Unit vector
C) Position vector
D) Null vector
#94 In the head-to-tail rule, the resultant vector is drawn from the tail of the first vector to the:
A) Tail of the last vector
B) Head of the last vector
C) Head of the first vector
D) Tail of the resultant vector
#95 A body is in rotational equilibrium if the net torque is zero. This means:
A) It is at rest
B) Its angular acceleration is zero
C) Its linear acceleration is zero
D) Both A and B
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