A liquid is in a streamline flow through a pipe of non-uniform cross-section. Prove that the sum of its
kinetic energy, pressure energy and potential energy per unit volume remains constant throughout the
flow.
a) State the law related to it.
b) The terminal velocity of a copper ball of radius 2.0 mm falling through a tank of oil at 200C is 6.5
cm/sec. Compute the viscosity of the oil at 200C. Density of oil = 1.5×103
kg/m3
, density of copper =
8.9×103
kg/m3.
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