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Homework Statement
i just want to know what the modulus of the speed (u) would if
Homework Equations
u = (-2/r)er + (2/r)etheta
The thing is i get confused with the er and etheta ..do these just mean the direction...this topic is fluid mechanics
The Attempt at a Solution
i reckon the answer is square root 8/r ...as i reckon the e's dont get affect...can some one verify this