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The Gravitational Potential is the work done in moving a unit mass (1kg) from an infinite distance to a point in a radial gravitational field. The Gravitational Potential is defined as being zero an infin...

Rearrange differential equation to get 1/x(x+1) dx = 1/y dy. Separate x side into partial fractions where 1/x(x+1) = 1/x - 1/(x+1). Integrate each side. Resulting equation involves natural logs. Substitut...

Using Binomial expansion or Pascal's triangle, expand (1+x)^4 to get 1+4x+6x^2+4x^3+x^4. Then, by substituting √y for x, get 1 + 4y^1/2 + 6y +4y^3/2 +y^2. Then, using the rules of integration, the expansi...

In order to move to the top band of marks, it is important to not just describe and explain, but to give your own point of view on the issue. Giving your judgement is the key to getting the top marks. Aft...

In English, less and less people use the subjunctive, so it can be hard for us to recognise when it is needed in Spanish. However, we can generally follow this rule: when there is any level of doubt or un...