Ten questions. The result tells you which lessons you may skip.
A load of \(50\,\text{kg}\) hangs from a wire of cross-section \(5\,\text{mm}^2\). Take \(g = 10\,\text{m/s}^2\). The tensile stress in the wire is
A wire \(4\,\text{m}\) long stretches by \(2\,\text{mm}\). Its longitudinal strain is
A wire is loaded beyond its elastic limit and then unloaded. It
Up to which point of a stress-strain curve does Hooke's law hold?
A wire under a stress of \(10^8\,\text{Pa}\) shows a strain of \(5 \times 10^{-4}\). Its Young's modulus is
Two wires of the same metal carry the same load. Wire B is twice as long as wire A and has twice its diameter. The ratio of extensions \(\Delta L_B/\Delta L_A\) is
A steel wire and a copper wire are joined end to end and carry a load. Which is true?
One litre of water, with \(B = 2 \times 10^9\,\text{Pa}\), is put under an extra pressure of \(6 \times 10^6\,\text{Pa}\). Its volume falls by
A rubber cube of side \(10\,\text{cm}\), with \(G = 5 \times 10^5\,\text{Pa}\), is glued to the floor, and a force of \(50\,\text{N}\) acts along its top face. The shear angle is
A liquid has