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Whilst it is unlikely that an A-level student would be able to give the 'expected' answer to this question, as this would require knowledge of the biological phenomena of circadian rhythms, this question ...

There are four keys to answering this problem - when taken together, they turn a seemingly difficult calculation into a trivial one-line answer. The first is knowing Coulomb's inverse square law for the f...

This is something that will only come with practice, but trust me, it will come! The things that I find are best when learning a new language tend to be watching TV shows in the language (you can use Engl...

Multiples that equal 20: 1 and 20, 2 and 10, 4 and 5Which of these multiples add/subtract to give -9?= -4 and -5Therefore answer is:(x-4)(x-5)=0x= 4 or x= 5

Drawing a diagram for this would show that the height of the tree above us is given by tan(63)*15, so the total height is this added to 1.6 m. This gives a height of 31 m.