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How do I express complex numbers in the form re^iθ? Complex numbers have a general form of a+ib, i being imaginary. To answer this it is best shown on an argand diagram. Plot your complex number...

An alpha particle is made up of two neutrons and two protons. It is the same as the nucleus of a helium atom.

To find the maximum/minimum of a curve you must first differentiate the function and then equate it to zero. This gives you one coordinate. To find the other you must resubstitute the one already found in...

If a reaction is exothermic, it means that it gives out energy, heating up its surroundings, and so the products have less energy than the reactants.

If a reaction is endothermic, it means that it ...

Using "vous" shows respect towards elder people or people one meets for the first time. It is used for example with teachers, higher ranked colleagues and salesmen.

"Tu" is used...