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Molecules of a substance are able to move between cells. What are the two main processes by which this occurs? What is the main difference between these two processes?

Within cells the two main forms of cellular exchange are diffusion and osmosis. These two terms can sometimes be mixed up as they both mean "the movement of molecules of a substance from an area of high...
TD
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Explain why Germany started World War Two

When writing a response to this question, you should consider a range of reasons that led them to entering the war. One of the main reasons is explained below: The hatred for the Treat of Versailles: Hitler ...
WA
Answered by Will A. • History tutor
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How do I solve simultaneous equations given a linear and a quadratic equation?

Let's use the following example: y - x = 3 y^2 + x^2 = 29 . Firstly, the second equation is the quadratic equation because it has a y-squared term. The first equation is linear because it doesn't have any sq...
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Answered by Erica H. • Maths tutor
5830 Views

Find the values of a, b and c in the equation: (5x + 3)(ax + b) = 10x^2 + 11x + c.

We can go about solving this problem by equating the coefficients of x^2, x, and the constant c. First of all, we must expand the bracket (5x + 3)(ax + b). One helpful way of doing this correctly is the FOIL...
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Answered by Camilla R. • Maths tutor
6451 Views

In a doppler shift why does a moving source show no increase in speed of the mechanical waves emitted?

I'll first ask the student to explain the difference between a moving source and moving observer, prompting them until they get something like this(asking them to draw a diagram if needed)- When the observer...
JG
Answered by James G. • Physics tutor
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