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A cylindrical tube with its base as shown in the figure, is filled with water. It is moving down with a constant acceleration a along a fixed inclined plane with angle theta=45 degrees. P1 and P2 are pressures at points 1 and 2, respectively, located at the base of the tuve. Let beta=(P1-P2)/[(rho)gd], where rho is density of water, d is the inner diameter of the tube and g is the acceleration due to gravity. Which of the following statement(s) is (are) correct?
A) beta=0 when a=g/2^(1/2)
B) beta greater than 0 when a=g/2^(1/2)
C) beta=[2^(1/2)-1]/2^(1/2) when a=g/2
D) beta=1/2^(1/2) when a=g/2

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