Ten questions. The result tells you which lessons you may skip.
A plate of area \(0.5\,\text{m}^2\) slides at \(0.2\,\text{m/s}\) on a film of oil \(2\,\text{mm}\) thick, with \(\eta = 0.1\,\text{Pa s}\). The force needed to keep it moving steadily is
The dimensions of the coefficient of viscosity are
The air in a room is heated from \(20\,°\text{C}\) to \(40\,°\text{C}\). Its viscosity
Water flows steadily through a pipe in streamline flow. The viscous stress is largest
Air (\(1.2\,\text{kg/m}^3\), \(\eta = 2 \times 10^{-5}\,\text{Pa s}\)) flows at \(1\,\text{m/s}\) through a pipe \(2\,\text{cm}\) across. Its Reynolds number is
In streamline flow, the viscous drag on a small sphere is proportional to
A ball of density \(4000\,\text{kg/m}^3\) is let go at rest in water of density \(1000\,\text{kg/m}^3\). Take \(g = 10\,\text{m/s}^2\). Its acceleration at the instant of release is
A steel ball of radius \(2\,\text{mm}\) falls through glycerine at a terminal velocity of \(1\,\text{cm/s}\). A steel ball of radius \(4\,\text{mm}\) in the same glycerine falls at
Sixty-four identical drops, each falling at a terminal velocity \(v_0\), merge into one drop. It falls at
The radius of a tube is halved, with the same pressure difference, length and liquid. The flow through it becomes