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For a steady flow in the pipe, at one place the cross-sectional area is 0.5 ㎝2 and the speed is 12 ㎝/ s, then at another place where the speed is 4 ㎝/ s, the cross-sectional area is: ()

A. 1.0㎝2
B. 1.5㎝2
C. 2.0㎝2
D. 2.15㎝2

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For a steady flow in the pipe, at one place the cross-sectional area is 0.5 ㎝2 and the speed is 12 ㎝/ s, then at another place where the speed is 4 ㎝/ s, the cross-sectional area is: ()

A. 1.0㎝2 B. 1.5㎝2 C. 2.0㎝2 D. 2.15㎝2

When using stokes law to measure the viscosity of a fluid, the object used should be :()

If the diameter of a certain blood vessel is doubled, and all else remains unchanged, the blood flow through it becomes () the original value.

The conditions under which Bernoulli's equation applies are ().

After the diver leaves the springboard, he curls his arms and legs as much as he can in the air so that()

A. 1.0㎝2
B. 1.5㎝2
C. 2.0㎝2
D. 2.15㎝2