美国麻省理工大学：《结构分析与设计技术》教学资源（讲义）CQ5

Concept Question The following expression is the right statement of linear momentum balance for a deforming body of an arbitrary material fdv at at Vp+uVv+f vdv x fdv+ x tds Dt V·σ+f Eqn、(1) and eqn3) qn. (2)and Eqn. (4) Eqn、(1) and eqn4) E qn DKDU

� � � ++++ ++++ ++++ ++++ ++++ Concept Question ++++ ++++ ++++ ++++ ++++ The following expression is the right statement of linear momentum balance for a deforming body of an arbitrary material: ∂v ρ dV = fdV + n · σdS (1) V ∂t V S ∂v + v · �v = −�p + µ�2 v + f (2) � ∂t � � D ρx × vdV = x × fdV + x × tdS (3) Dt V V S ∂v � · σ + f = ρ (4) ∂t 1. ++++ Eqn.(1) and Eqn.(3) 2. ++++ Eqn.(2) and Eqn.(4) 3. ++++ Eqn.(1) and Eqn.(4) 4. ++++ Eqn.(3) 5. ++++ DKDU

Answer The correct answer to the concept question is: 3 Eqn. (1)and Eqn. (4)

++++ ++++ ++++ ++++ ++++ Answer ++++ ++++ ++++ ++++ ++++ The correct answer to the concept question is: 3. ++++ Eqn.(1) and Eqn.(4)