Answer
The correct answer is:
(b) conservation of energy
Work Step by Step
$P_1+\frac{1}{2}\rho~v_1^2+\rho~g~h_1 = P_2+\frac{1}{2}\rho~v_2^2+\rho~g~h_2$
We can think of each term in Bernoulli's equation as an energy density. $P_1$ is the pressure energy density, $\frac{1}{2}\rho~v_1^2$ is the kinetic energy density, and $\rho~g~h_1 $ is the potential energy density. The form of the equation shows that the energy density is conserved.
Bernoulli's equation is an expression of conservation of energy.
The correct answer is:
(b) conservation of energy
