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Calculate the acceleration of particle thats velocity changes from 20ms^-1 to 40ms^-1 in 5 seconds, assuming its constant.

Acceleration is the rate of change of velocity, so we subtract the final velocity from the initial velocity and divide it by the time taken for the change. In this case the acceleration is (40-20)/5 = 4ms^-2...
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Answered by Orlando F. • Physics tutor
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How can we begin to explain the causes of the First World War?

The best way to tackle the question is first to understand what they are asking of you, and then look closely at how the question is structured because this is often a key to structuring your essay. In this ...
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Answered by Filipa R. • History tutor
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Diamond is very hard because:

It is a giant covalent structure.
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Answered by Rifat M. • Chemistry tutor
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A line has equation y = 3x + 4, write down the gradient of the line.

gradient = 3
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Answered by Rifat M. • Maths tutor
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What is the name given to waves where the oscillations are in the same direction as the wave energy?

When the oscillations of the waves are parallel to the wave energy, we call the wave longitudinal. An example of a longitudinal wave could be s ound waves.
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Answered by Rifat M. • Physics tutor
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