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first of all we have to recognise the general form of the equation, similar to the equation of a line but we just have to add one more term due to the fact that it is a second degree equation: y=ax^2<...

A transverse wave is a wave where the direction of vibration is perpendicular (90 degrees) to the direction of travel (an example would be a wave in the sea), and a longitudinal wave is a wave where the v...

The resistance of a filament lamp increases as the potential difference increases because the filament becomes hot. The movement of electrons (which is what causes the current) makes the atoms inside the ...

Osmosis is the passive movement of water molecules down their concentration gradient across a partially permeable membrane. In plant cells, water moves via osmosis into the vacuole of the cell. The osmoti...

Tackling an unseen prose passage and having to write an essay about it can be daunting, namely because there is usually a lot of text and a lot more to read than if it is a poem. Opening an exam paper and...