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# dimensional analysis help

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1. This is from the lecture, can someone explain why there's a square beside the T in the first line? I understand what's been written in the explanation but still don't know where the square comes from.
2. Im not sure what you mean. Im guessing you mean this?

If that is the case then its because you have expanded the power out.
3. (Original post by Airess3)
This is from the lecture, can someone explain why there's a square beside the T in the first line? I understand what's been written in the explanation but still don't know where the square comes from.

If you look at your lecture note, there is an equation which say

s = k am tn

The dimension for [a] is [L/T2] .
4. (Original post by Airess3)
This is from the lecture, can someone explain why there's a square beside the T in the first line? I understand what's been written in the explanation but still don't know where the square comes from.
What square? It simply says the units for acceleration are length/time_squared. Since the equation is a^m, the units are also raised ^m which gives length^m multiplied by (T^-2)^m . Square brackets are put around length and time to show we are equating units instead of variables.

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