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What is osmosis and how does it work?

Osmosis is defined as the movement of water from an area of high water potential to an area of lower water potential, across a partially permeable membrane. This means that water molecules moves from a very ...
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Answered by Rebekah D. • Biology tutor
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What makes a good argument in an essay or exam?

A good argument should consist of one clear, central idea that runs throughout your essay. This is important because you want to give a concise answer to the question. It should be simple enough that it can ...
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Answered by Alex H. • History tutor
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How does a skydiver reach terminal velocity?

At the start of the jump, the skydiver starts accelerating downwards due to his weight (force of gravity). There is a resultant force downwards as the weight is larger than the air resistance (weight>air ...
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Answered by Teodor N. • Physics tutor
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An electric Iron rated at 2600 W contains a steel plate, heated to a working temperature of 215°C. Room temp=18°C. Deduce whether the plate could reach its working temperature in less than 1 minute. Mass (steel plate)=890g & C (steel)=450J/kg/K

We are given the power of the iron, 2600W and we know that Power = Energy/Time. We are also given the specific heat capacity of steel (C) which gives us a clue that we should use Q = m c T(delta) (meaning, E...
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Answered by Oni B. • Physics tutor
4651 Views

Simplify fully 3/(2x + 12) - (x - 15)/(x^2 - 2x - 48)

The first step to answering this question is recognising that the denominators should be factorised to find any common factors. Factorising 3/2x+12 gives 3/2(x+6) and factorising (x-15)/(x 2 -2x-48) gives (x...
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Answered by Archie C. • Maths tutor
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