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 × 10 6 N/m 2 . (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.
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 × 10 6 N/m 2 . (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.
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
×
10
6
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.
Poiseuille's equation describes the flow rate of a viscous fluid in a pipe with a pressure
difference AP across the ends of the pipe.
Q
=
ΔΡ
R
where R is the resistance to the flow.
The resistance to the flow is given by:
R =
8vL
πρ4
,
where is the coefficient of viscosity of the fluid, and L and r are the length and
radius of cross section of the pipe, respectively.
Note: This is similar to the current in an electrical circuit:
I =
=
AV
R
where AV is the voltage difference between the ends of the of a wire of
resistance R.
To increase the flow rate, you should could (pick all statements that are true):
decrease the pressure difference between the two ends of the pipe
increase the pressure difference between the two ends of the pipe
increase the radius of the pipe
decrease the radius of the pipe
A block of wood floats in fresh water with
0.834 of its volume V submerged and in oil
with 0.899 V submerged. Find the density
of (a) the wood and (b) the oil.
(a) Number
(b) Number
i
HI
i
Units
Units
>
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.
University Physics with Modern Physics (14th Edition)
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