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In a-level physics: For any equation to be valid, it must be homogeneous. Explain what is meant by a homogeneous equation.

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Solution

In the context of A-Level Physics, a homogeneous equation refers to an equation where every term has the same dimensions. This means that the units on both sides of the equation must be the same.

For example, in the equation F = ma (Force equals mass times acceleration), the dimensions on both sides are the same. Force is measured in Newtons, which is equivalent to kgm/s^2 (kilogram meter per second squared). On the right side of the equation, mass is measured in kilograms and acceleration in meters per second squared. When you multiply these together, you also get kgm/s^2.

So, the equation is homogeneous because the dimensions are the same on both sides. This is a fundamental principle in physics because equations represent physical relationships, and it wouldn't make sense to equate quantities of different types (like trying to equate a length to a time, for example).

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