When making a force diagram (FD) and its partner momentum diagram (MD) to set up the equations for a momentum equation problem (see Fig. 6.10), which of the following elements should be in the FD and which should be in the MD? (Classify each of the following as either “FD” or “MD”.)

a. Each mass stream with product m^· ovo or product m^· ivi crossing a control surface boundary

b. Forces required to hold walls, vanes, or pipes in place

c. Weight of a tank that contains the fluid

d. Weight of the fluid

e. Pressure force associated with a fluid flowing across a control surface boundary

Transcribed Image Text:

(b) dt cs cs W (c) Flange F Water P1A (a) Force diagram Momentum diagram F = rinv, cose (d) P141 + F,- W= mv,sine – mv (e)