gravitational force of attraction towards the center of the earth.
Correct answer: (E) gravitational force of attraction towards the center of the earth.
86. Two coplanar couples having equal and opposite moments
balance each other
produce a couple and an unbalanced force
are equivalent
produce a moment of couple
can not balance each other.
Correct answer: (E) can not balance each other.
87. Two non-collinear parallel equal forces acting in opposite direction
balance each other
constitute a moment
constitute a couple
constitute a moment of couple
constitute a resultant couple.
Correct answer: (E) constitute a resultant couple.
88. When trying to turn a key into a lock, following is applied
coplanar force
non-coplanar forces
lever
moment
couple.
Correct answer: (E) couple.
89. Which is the correct statement about law of polygon of forces ?
if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
if a polygon representing forces acting at a point is closed then forces are in equilibrium
if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
none of the above.
Correct answer: (D) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
90. Which of the following do not have identical dimensions ?
Momentum and impulse
Torque and energy
Torque and work
Kinetic energy and potential energy
Moment of a force and angular momentum.
Correct answer: (E) Moment of a force and angular momentum.