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Why did the English Civil War start?

The English Civil Wars started due to a combination of long and short term factors. In the short-term, the war can be seen to be triggered by an immediate breakdown in the relationship between the King, Char...
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Answered by Marius S. History tutor
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why is gravitational potential negative?

the gravitational potential is set to be 0 at a distance of infinity.
NS
Answered by Navdeep S. Physics tutor
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What is the equation for calculating the surface area of a cylinder?

= 2πr 2 + πd x height (= area of the 2 circle at either end + area of rectangular surface around the cylinder)
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Answered by Young C. Maths tutor
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Briefly explain Berkeley's idealism.

For Berkely, there is not a world with physical objects that is external to us. The sense data we perceive with our sense organs are bundled together as 'ideas'. For example the idea 'chair' is a bundle of s...
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Answered by Young C. Philosophy tutor
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Explain the collision theory.

Collision theory states that for a reaction to occur, particles must collide with sufficient energy, sometimes in specific orientation. The minimum amount of energy needed for a reaction to occur is called t...
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Answered by Young C. Chemistry tutor
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