The period p of a pendulum depend on its length , mass as well as the acceleration due to gravity . use dimensional analysis to show that equation for p has the form
=√
where is a dimensionless costant.

Explanation:

Period P has units of seconds (s).

Length has units of meters (m).

Mass has units of kilograms (kg).

Acceleration has units of meters per second squared (m/s²).

Dimensional analysis:

s = √(m / (m/s²))

Therefore:

P = k √(L/g)

where k is a dimensionless constant.

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well clustered together.

points close on a scatter diagram