19. Fluid Mechanics

When air is drawn into a wind tunnel used for testing automobiles, which principle explains why the speed of the air increases as it passes through a narrower section of the tunnel?

Which of the following actions is most likely to cause a laminar flow in a pipe to become turbulent?

A container is filled with oil and is open to the atmosphere on the left side. If the oil flows steadily from the left (point $1$) to the right (point $2$) through a horizontal pipe of varying cross-sectional area, which of the following statements about the speed of the oil at points $1$ and $2$ is correct according to the continuity equation?

If water flows through a horizontal pipe with a speed of $4.0m/s$ at point 1 where the cross-sectional area is $0.020m^2$, what is the speed of the water at point 2 where the cross-sectional area is $0.010m^2$? Assume the flow is steady and incompressible.

When water flows through a pipe that gets narrower, what happens to the speed of the water as it enters the narrower section according to the continuity equation $Av=\mathrm{constant}$?

A pitot tube is used to measure which of the following quantities in a fluid flow?

A 2.0 mL syringe has an inner diameter of 6.0 mm, a needle inner diameter of 0.25 mm, and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100. The nurse empties the syringe in 2.0 s. What is the flow speed of the medicine through the needle?

According to the Bernoulli principle and the continuity equation, what causes the decrease in pressure as water flows through a hose that narrows in diameter?

A vertical jet of water leaves a nozzle with speed $v_0$ and cross-sectional area $A_0$. As the jet rises to a height $h$ above the nozzle, what is the cross-sectional area $A$ of the jet at that height, assuming incompressible, non-viscous flow and neglecting air resistance?

Home Repair. You need to extend a 2.50-inch-diameter pipe, but you have only a 1.00-inch-diameter pipe on hand. You make a fitting to connect these pipes end to end. If the water is flowing at 6.00 cm/s in the wide pipe, how fast will it be flowing through the narrow one?

A soft drink (mostly water) flows in a pipe at a beverage plant with a mass flow rate that would fill 220 0.355-L cans per minute. At point 2 in the pipe, the gauge pressure is 152 kPa and the cross-sectional area is 8.00 cm². At point 1, 1.35 m above point 2, the cross-sectional area is 2.00 cm². Find the (b) volume flow rate. (c) flow speeds at points 1 and 2.

A shower head has 20 circular openings, each with radius 1.0 mm. The shower head is connected to a pipe with radius 0.80 cm. If the speed of water in the pipe is 3.0 m/s, what is its speed as it exits the shower-head openings?

Water is flowing in a pipe with a varying cross-sectional area, and at all points the water completely fills the pipe. At point 1 the cross-sectional area of the pipe is 0.070 m², and the magnitude of the fluid velocity is 3.50 m/s. (c) Calculate the volume of water discharged from the open end of the pipe in 1.00 hour.