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The subjunctive is a mood meaning it's quite difficult to translate it directly and/or visibly into English. Generally, it follows set phrases. We can group the phrases by their meanings ...

It's impossible to remember evaluation points for every possible essay that may come up on the exam, so it's a good idea to always think of what's covered in the Issues and Debates topics, and apply it to...

At first this question can seem confusing, but by breaking it down we can better understand what we are being asked to do. Firstly, we need to recall le Chatelier's principle - that an equalibrium will sh...

The doppler effect is the change in frequency and wavelength of waves coming from a wave source moving relative to you. If a wavesource is stationary then the waves in all directions all have the same fre...

The forces should be resolved in two directions: parallel to the plane, and perpendicular to the plane. Friction will act parallel to the plane (up the slope), and the normal force wil act perpendicular t...