Physics
Vectors and Equilibrium
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#49 The direction of a vector is given by:
A) Its magnitude
B) A unit vector
C) The angle it makes with an axis
D) Both B and C
#50 If the resultant of two vectors is maximum, they are acting:
A) At $90^\circ$ to each other
B) At $180^\circ$ to each other
C) In the same direction
D) In opposite directions
#51 A couple produces only:
A) Linear motion
B) Rotational motion
C) Both linear and rotational motion
D) No motion
#52 The moment of a couple is the product of one of the forces and:
A) The perpendicular distance between them
B) The sum of the forces
C) The angle between them
D) The point of application
#53 A body in equilibrium can have a non-zero:
A) Velocity
B) Acceleration
C) Net force
D) Net torque
#54 Which of the following is true for an object in dynamic equilibrium?
A) $\sum \vec{F} \neq 0$
B) $\sum \vec{F} = 0$ and $\sum \vec{\tau} = 0$
C) Velocity is zero
D) Acceleration is non-zero
#55 The condition $\sum \vec{F} = 0$ implies:
A) No acceleration
B) No net force
C) Constant velocity
D) All of the above
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