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Homework Statement:
 Use dimensional analysis to predict how the speed of sound (u) in a gas may be influenced by the gas pressure (p), gas density (r) and acceleration due to gravity (g).
Relevant Equations:

u∝p^a r^b g^c
p = ML^1T^2
r= ML^3
g=LT^2
I've been going round in circle and am stuggling as maths is not my strong suit. Any ideas?
Up to the point where i equate the powers and then confuse myself, any help would be greatly appreciated.
Up to the point where i equate the powers and then confuse myself, any help would be greatly appreciated.