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...technique with a knowledge of the multiplication tables up to 10. Example 12 A machine in a factory puts tops on bottles at the rate of 1 every second. (a) How many bottles does it top in a 10 hour working day? (b) How many bottles does it top in a 30 day month, at 10 hours a day? Answer (a) There are 60 seconds in a minute and so it puts on 60 tops a minute. There are 60...

...technique for string instruments that are normally played with a bow. Piano strings (source) struck with a felt-covered hammer (cause); this is the basic mechanism of a modern piano. Hand (source) clapping (cause); this is central to traditional Spanish flamenco music. Source–cause descriptions are probably the most common way of describing sounds. Your list probably...

...techniques, but plate glass is easily made. So the material is first prepared as a glass and sheets are made by hot rolling (it is very viscous). Then a heat treatment encourages crystallisation with the hexagon axes randomly oriented. If the individual crystals are very small they can accommodate anisotropic shape changes without inducing large thermal stresses between...