A force of $18\ \text{N}$ is applied to a spanner at a distance of $0.25\ \text{m}$ from the nut. The angle between the spanner and the force is $60^\circ$.

A uniform beam is in rotational equilibrium about a pivot.

A constant resultant torque acts on a rigid body whose moment of inertia remains constant.

A wheel rotates at 240 revolutions per minute.

Two point masses of $0.20\ \text{kg}$ are fixed to a light rod, each $0.30\ \text{m}$ from an axis through the rod’s centre and perpendicular to the rod.

A resultant torque of $6.0\ \text{N m}$ acts on a flywheel of moment of inertia $1.5\ \text{kg m}^2$.

A disc of moment of inertia $0.40\ \text{kg m}^2$ rotates clockwise at $12\ \text{rad s}^{-1}$.

A flywheel has moment of inertia $2.0\ \text{kg m}^2$ and angular speed $5.0\ \text{rad s}^{-1}$.

A turntable starts from rest and has a uniform angular acceleration of $3.0\ \text{rad s}^{-2}$ for $4.0\ \text{s}$.

Two wheels have the same mass and radius. Wheel X has most of its mass near the axle; wheel Y has most of its mass near the rim.

A skater rotates with arms extended. The skater then pulls the arms in so that the moment of inertia decreases by a factor of 2. No external torque acts.

A constant torque of $0.80\,\text{N}\,\text{m}$ acts on a rotor for $5.0\,\text{s}$.

Two equal and opposite horizontal forces of magnitude 12 N act on a rigid body. Their parallel lines of action are separated by 0.40 m.

A solid cylinder with $I=\frac{1}{2}MR^2$ rolls without slipping with centre-of-mass speed $v$.

Two coaxial discs are brought into contact and rotate together after slipping. Disc 1 has (I) and angular speed (+3\omega). Disc 2 has (2I) and angular speed (-\omega).

A point on the rim of a wheel has tangential speed $6.0\ \mathrm{m\,s^{-1}}$ and centripetal acceleration $18\ \mathrm{m\,s^{-2}}$.