Question

Water (density = 1.0 x103kg/m3) flows downhill through a pipe of diameter 1.5 cm. Its speed at the top of the hill is 7.2 m/s. If the hill is 9.5 m high, what is the gravitational potential energy density of the water at the top of the hill relative to the bottom?
A) cannot be calculated without knowing the pressure
B) 120 J/m3
C) 7.2 x 103J/m3
D) 9.5 x 103J/m3
E) 9.3 x 104J/m3

Answer

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