Physics, 10.09.2019 17:30, adityamahesh2002
Acommon parameter that can be used to predict turbulence in fluid flow is called the reynolds number. the reynolds number for fluid flow in a pipe is a dimensionless quantity defined as re = rhovd μ where rho is the density of the fluid, v is its speed, d is the inner diameter of the pipe, and μ is the viscosity of the fluid. viscosity is a measure of the internal resistance of a liquid to flow and has units of pa · s. the criteria for the type of flow are as follows. • if re < 2,300, the flow is laminar. • if 2,300 < re < 4,000, the flow is in a transition region between laminar and turbulent. • if re > 4,000, the flow is turbulent. (a) let's model blood of density 1.06 103 kg/m3 and viscosity 3.00 10-3 pa · s as a pure liquid, that is, ignore the fact that it contains red blood cells. suppose it is flowing in a large artery of radius 1.25 cm with a speed of 0.0650 m/s. show that the flow is laminar. (state the reynolds number of the flow, which will be less than 2,300, indicating laminar flow.) (b) imagine that the artery ends in a single capillary so that the radius of the artery reduces to a much smaller value. what is the radius of the capillary that would cause the flow to become turbulent? (use the minimum reynolds number for which flow is fully turbulent.)
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Physics, 21.06.2019 15:00, yungkxng57
An uncharged nonconductive hollow sphere of radius 18.0 cm surrounds a 12.0 µc charge located at the origin of a cartesian coordinate system. a drill with a radius of 1.00 mm is aligned along the z axis, and a hole is drilled in the sphere. calculate the electric flux through the hole.
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Physics, 22.06.2019 02:30, ParallelUniverse
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Physics, 22.06.2019 11:20, cjd1214812148
The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)
Answers: 3
Acommon parameter that can be used to predict turbulence in fluid flow is called the reynolds number...
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