Water is flowing in a horizontal pipe bend at a velocity of $10 \mathrm{ft} / \mathrm{s}$. The radius of curvature of the inside of the bend is 4 in., and the pipe ID is 2 in. A mercury manometer is connected to taps located radially opposite to each other on the inside and outside of the bend. Assuming that the water velocity is uniform over the pipe cross section, what would be the manometer reading in centimeters? What would it be if the water velocity were $5 \mathrm{ft} / \mathrm{s}$ ? Convert the manometer reading to equivalent pressure difference in psi and $\mathrm{Pa}$.