6. Incompressible oil with density ρ is pumped through a cylindrical pipe at a constant mass flow rate. The first section of the pipe has a diameter d₁ and flow speed v₁. The diameter of the second section of the pipe is twice that of the first section. What is the flow speed in the second section?
(A)
v₁
(B)
v₁
(C) v₁
(D) 2v₁
(E) 4v₁
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統計: 尚無統計資料
統計: 尚無統計資料