Physics
Vectors and Equilibrium
Page 18 of 25
#137 If $\vec{A} = 3\hat{i} + 4\hat{j}$, then the angle it makes with the y-axis is:
A) $\cos^{-1}(3/5)$
B) $\sin^{-1}(3/5)$
C) $\tan^{-1}(4/3)$
D) $\tan^{-1}(3/4)$
#138 The negative of a vector has the same magnitude but:
A) Opposite direction
B) Same direction
C) Perpendicular direction
D) No direction
#139 The magnitude of a vector $\vec{A}$ is represented by:
A) $\vec{A}$
B) $|\vec{A}|$
C) $\hat{A}$
D) A
#140 The cross product of two vectors is a:
A) Scalar
B) Vector
C) Unit
D) Null
#141 The dot product of two vectors is a:
A) Scalar
B) Vector
C) Unit
D) Null
#142 Which of the following is not a vector?
A) Displacement
B) Temperature
C) Momentum
D) Electric field
#143 The condition for equilibrium is also known as:
A) Newton's second law
B) Newton's first law
C) The law of conservation of momentum
D) The law of conservation of energy
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