Ten questions. The result tells you which lessons you may skip.
A particle has momentum \(6\,\text{kg m/s}\) at a distance of \(4\,\text{m}\) from a point O. The angle between \(\vec r\) and \(\vec p\) is \(30°\). Its angular momentum about O is
A \(0.5\,\text{kg}\) particle moves at a steady \(4\,\text{m/s}\) along a straight line that passes \(3\,\text{m}\) from a point O. Its angular momentum about O
A \(0.1\,\text{kg}\) particle moves on a circle of radius \(0.5\,\text{m}\) at \(2\,\text{m/s}\). Its angular momentum about the centre is
A thin ring and a uniform disc of the same mass and radius spin at the same angular velocity about their central axes. Compared with the disc, the ring has
A spinning system changes its shape, so its moment of inertia changes. Which relation still holds?
A flywheel with \(I = 2\,\text{kg m}^2\) starts from rest. A torque of \(6\,\text{N m}\) acts on it for \(3\,\text{s}\). Its angular velocity is then
A rod on a smooth table is pivoted at one end. The same short blow strikes it first at its middle, then at its free end. Struck at the end, the rod starts turning
A skater with no external torque on her halves her moment of inertia. Her angular velocity
For the same skater, her kinetic energy of rotation
A ball strikes a rod hinged at the ceiling and sticks to it. Through the impact, the quantity conserved is