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Water is flowing into a rightcircular cone at the rate r (volume of water per unit time). The cone has radius a, altitude b and the vertex or "tip" is pointing downwards. Find the rate at which the surface is rising when the depth of the water is y.

Always a good first step to a problem like this, is to draw a diagram, making sure to label any lengths. The unknown in this question, is the rate at which the surface of water, in the cone, is rising. Howev...
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Answered by Joss O. • Maths tutor
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I'm struggling to revise for the listening section of the exam? i.e how do I remember my score annotations?

It's all about making the connections between what you're hearing and what you understand is going on. Your A-Level Anthology should be heavily annotated with all important explanations in there. The best wa...
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Answered by Cristina C. • Music tutor
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Describe how the coronary arteries can become narrowed and explain how this can lead to a heart attack.

Eating a diet high in saturated fat has been linked to high levels of cholesterol in the blood.If there is too much cholesterol in the blood it can start to build up in the coronary arteries. This causes pla...
Answered by • Biology tutor
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Find the general solution to the differential equation; y'' + 4y' = 24x^2

The first step in tackling any second order differential equation is to find the Auxiliary Function . Looking at the equation's left hand side, we can find the derivative terms - we will substitute the deriv...
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Outline two ways in which education is ethnocentric

Remember to bullet point answers to save time on short markers. Give a point then explain using an example in the explanation to ensure you definitely get the second mark.Holidays are based around traditiona...
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Answered by Molly H. • Sociology tutor
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