Answer:Given the following form of conservation of linear momentum equation for a fluid in a CV in the y-direction (vertical) -V A = -mg, the following are true:Only I, II, and III.
Steady Flow, negligible weight, and uniform velocity at (1) are the true statements regarding the given form of conservation of linear momentum equation for a fluid in a CV in the y-direction (vertical).
To find out whether the following statements are true, let's have a look at them:Steady Flow: If the flow is steady, it implies that the properties of the flow don't change with time.Weight is Negligible:
Weight is negligible implies that the weight of the fluid can be considered negligible for the given conditions.
(This implies that there is no change in pressure from the top to the bottom of the fluid due to its weight).Uniform Velocity at (1): Uniform velocity implies that the velocity of the fluid doesn't change at point (1).All of them cannot be true as the last statement is incorrect.
If the fluid is incompressible, it has constant density. But this statement doesn't necessarily mean that the velocity is uniform or the flow is steady or weight is negligible. Hence, only I, II, and III are true.