1.

Consider a model of finite control volume (volume V and surface area) fixed in space with elemental volume dV, vector elemental surface area d ( vec{S} ), density and flow velocity ( vec{V} ).
( rho vec{V}.d vec{S} ) is positive when _____________

A. The mass flow is outward
B. The mass flow is inward
C. The mass flow is positive
D. The mass flow is negative
Answer» B. The mass flow is inward


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