Chapter 10: Q80GP (page 260)
How high should the pressure head be if water is to come from a faucet at a speed of \({\bf{9}}{\bf{.2\;m/}}{{\bf{s}}^{\bf{2}}}\) Ignore viscosity.
Short Answer
The height of pressure head is\(4.31\;\;{\rm{m}}\).
Chapter 10: Q80GP (page 260)
How high should the pressure head be if water is to come from a faucet at a speed of \({\bf{9}}{\bf{.2\;m/}}{{\bf{s}}^{\bf{2}}}\) Ignore viscosity.
The height of pressure head is\(4.31\;\;{\rm{m}}\).
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Get started for free(III) A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein (Fig. 10–55). The inside diameter of the 25-mm-long needle is 0.80 mm, and the required flow rate is \(2.0\;{\rm{c}}{{\rm{m}}^3}\) of blood per minute. How high h should the bottle be placed above the needle? Obtain \(\rho \) and \(\eta \) from the Tables. Assume the blood pressure is 78 torr above atmospheric pressure.
Figure 10-55
(I) Engine oil (assume SAE 10, Table 10–3) passes through a fine \({\bf{1}}{\bf{.80}}\;{\bf{mm}}\)-diameter tube that is \({\bf{10}}{\bf{.2}}\;{\bf{cm}}\)long. What pressure difference is needed to maintain a flow rate of \({\bf{6}}{\bf{.2}}\;{\bf{mL/min}}\)?
Why does the canvas top of a convertible bulge out when the car is traveling at high speed? [Hint: The windshield deflects air upward, pushing streamlines closer together.]
What diameter must a \({\bf{15}}{\bf{.5}}\;{\bf{m}}\)-long air duct have if the ventilation and heating system is to replenish the air in a \({\bf{8}}{\bf{.0}}\;{\bf{m \times 14}}{\bf{.0}}\;{\bf{m \times 4}}{\bf{.0}}\;{\bf{m}}\) room every \({\bf{15}}{\bf{.0}}\;{\bf{min}}\)? Assume the pump can exert a gauge pressure of \({\bf{0}}{\bf{.710 \times 1}}{{\bf{0}}^{\bf{3}}}\;{\bf{atm}}\).
(II)A 180 km/h wind blowing over the flat roof of a house causes the roof to lift off the house. If the house is\(6.2\;{\rm{m}} \times {\rm{12}}{\rm{.4}}\;{\rm{m}}\)in size, estimate the weight of the roof. Assume the roof is not nailed down.
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