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To find how much time the ball spends above 29.4m, we need to find the times at which the ball is at 29.4m above its starting point, and then calculate the difference between these times. Ac...

A2.   First thing to work out is the moles of NaOH added, since moles = concentration x volume, = 0.0108 mol/dm^3 x 50ml, but need volume to be in units of Litres to match with the units of dm^3 so the fo...

A1.   First it is important to know that nitric acid (HNO3) is a strong acid and so [HNO3] = [H+]    Beaker A contains 100cm^3 = 100ml   Final volume is 150ml (50cm^3 of distilled water is added to beaker...

The main difference is that order of objects matters for permutations. Both involve choosing k objects from a group of size n. Permutations are used to ...

Students may discuss how men and women use language 'differently', by analysing a text in a number of ways. Students may examine differences in the following areas of language: lexis and semantics (the vo...