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Physics
Problem
The viscosity of a liquid flowing in a pipe is doubled while its density and the pipe radius remain unchanged. To reach the onset of turbulence, the average flow speed must be a)
v
new
=
v
0
2
v_{\text{new}}=\dfrac{v_0}{2}
v
new
=
2
v
0
b)
v
new
=
2
v
0
v_{\text{new}}=\sqrt{2}\,v_0
v
new
=
2
v
0
c)
v
new
=
2
v
0
v_{\text{new}} = 2\,v_0
v
new
=
2
v
0
d)
v
new
=
v
0
v_{\text{new}} = v_0
v
new
=
v
0
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