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How do I remember the difference between the perfect and imperfect tenses?

A way of remembering the difference is to think that the word 'perfect' comes from the Latin 'perfectus' meaning ' completed ' while 'imperfect' will therefore mean not yet completed or on-going . The perfec...
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Answered by Lily G. • French tutor
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How can an object in circular motion be accelerating when it's at the same speed?

In Physics, there are two types of numbers: scalars and vectors. Scalars are just a normal number, as we are used to. Vectors also have a direction associated with them. Thus, variables like temperature and ...
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Answered by Toby T. • Physics tutor
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What does differentiation actually mean?

Differentiation is defined as the rate of change of a function. Imagine we had a function f(x), which we shall let equal x 2 . We all know what the graph of x 2 looks like. The derivative of x 2 is 2x. This ...
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Answered by Toby T. • Maths tutor
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Outline principles that define the Biological Level of Analysis

Emotions and behaviours are products of the anatomy and physiology of the nervous and endocrine systems Animal research may inform our understanding of human behaviour Patterns of behaviour can be inherited;...
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Name the types of timber and their characteristics

Hardwood: deciduous trees darker in general more expensive harder, stronger in general Softwood: coniferous trees cheaper, lighter in colour, less dense
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