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Describe and explain the formation of a meander

Meanders are bends in a river. The formation first develops from alternating bars of sediment, called riffles. Low flows of water in the river have a low hydraulic radius which means there is not enough kine...
AK
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What is the difference between speed and velocity?

Velocity is a vector quantity so takes both magnitude and direction into account. Speed is a scalar so only takes magnitude into account. They both have units of meters per second.
SR
Answered by Sebastian R. • Physics tutor
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Solve x^2+4x-5=0 by completing the square.

x^2+4x-5=0(x+2)^2-(2)^2-5=0subtract 2^2 as (x+2)^2 = x^2+4x+4 when we want x^2+4x(x+2)^2-4-5=0(x+2)^2-9=0(x+2)^2=9square root both sidesx+2=+/-3x=-2+/-3x=-2+3 or x=-2-3x=1 or x=-5
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Answered by Evie M. • Maths tutor
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The radius of a pizza is 12cm, calculate the area of the pizza in terms of pi

To calculate the answer to this question we need to know the formula for the area of the circle. The area of a circle is: A = Pi x r^2 The value of r is given in the question; r = 12. We then just plug this ...
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Answered by Beth B. • Maths tutor
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GCSE 2011: Solve the simultaneous equations: y^2 = 2x + 29 and y = x - 3

This was the final question in AQA's 2011 non-calculator paper, and most top candidates will be looking to score all 5 marks that are on offer. Our usual technique for simultaneous equations isn't going to w...
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Answered by Ross G. • Maths tutor
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