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Short answer? Very. A piece should seldom be viewed in isolation from the context it was written in. It is important to be aware of any important historical events which may have influenced the author in the...

Rutherford revolutionised the atomic model with this experiment. At that time, the general idea was that of JJ Thompson, the "plum pudding" atomic model. Rutherford bombarded a sheet of gold with a...

Many Spanish words have accent marks (e.g. móvil , habló or fantástico ). While this seems odd for english speakers, the rules followd in Spanish are suprisingly straightforward! Accents mark word stress . T...

When you evaluate a definite integral, we can think about using the "+C" and see what happens. Let's take (INT)2x dx between 2 and 3. We then have [x 2 +C] between 2 and 3. For x=3 we have 9+C, and...

Differentiate x = u 2 to get dx = 2u du. We need to change the limits, too: 1 <= x <= 9 <==> 1 <= u 2 <= 9 <==> 1 <= u <= 3 (since we are given u > 0). Now we can substitute ...