Physics
Vectors and Equilibrium
Page 19 of 25
#145 The turning effect of a force is called:
A) Momentum
B) Impulse
C) Torque
D) Power
#146 The unit vector in the direction of vector $\vec{A}$ is given by:
A) $\vec{A}/|\vec{A}|$
B) $|\vec{A}|/\vec{A}$
C) $\vec{A} \cdot |\vec{A}|$
D) $\vec{A} \times |\vec{A}|$
#147 What is the angle between $\vec{A} = \hat{i}$ and $\vec{B} = \hat{j}$?
A) $0^\circ$
B) $45^\circ$
C) $90^\circ$
D) $180^\circ$
#148 The magnitude of the torque is given by $\tau = rF\sin\theta$. The maximum value of $\tau$ is:
A) $rF$
B) 0
C) $rF/2$
D) $2rF$
#149 A body is in rotational equilibrium if it is:
A) At rest
B) Rotating with constant angular velocity
C) Not accelerating rotationally
D) All of these
#150 The magnitude of the cross product is equal to the area of the parallelogram formed by the two vectors. This is a property of the:
A) Scalar product
B) Vector product
C) Both A and B
D) None of these
#151 Which of the following represents a scalar quantity?
A) Acceleration
B) Force
C) Work
D) Momentum
Page 19 of 25
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