Concrete is pumped from a cement mixer to the place it isbeing laid, instead of being carried in wheelbarrows. The flowrate is 200.0 L/min through a 50.0-m-long, 8.00-cm-diameterhose, and the pressure at the pump is 8.00×106 N/m2 . (a)Calculate the resistance of the hose. (b) What is the viscosityof the concrete, assuming the flow is laminar? (c) How muchpower is being supplied, assuming the point of use is at thesame level as the pump? You may neglect the power suppliedto increase the concrete’s velocity.
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
Concrete is pumped from a cement mixer to the place it is
being laid, instead of being carried in wheelbarrows. The flow
rate is 200.0 L/min through a 50.0-m-long, 8.00-cm-diameter
hose, and the pressure at the pump is 8.00×106 N/m2 . (a)
Calculate the resistance of the hose. (b) What is the viscosity
of the concrete, assuming the flow is laminar? (c) How much
power is being supplied, assuming the point of use is at the
same level as the pump? You may neglect the power supplied
to increase the concrete’s velocity.
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