Q: Bernoulli’s equation for fluid flow along a streamline is:

$$P + \frac{1}{2} \rho v^2$ + \rho g y = \text{constant}$$

Question 1

A block of wood with density $$\rho_{object} is $$placed in water with density $$\rho_{fluid}. If$$ $$\rho_{object} \u003c \rho_{fluid}$$, what will happen to the block?

Accepted Answer

The block will float, with part of it submerged.

Question 2

Which equation correctly describes the pressure at a depth $$h in a $$fluid of density $$\rho$$ open to the atmosphere?

Accepted Answer

$$P = P_0$ + \rho g h$$

Question 3

A hydraulic lift has two pistons. If the area of the input piston is $$A_1$$ and the area of the output piston is $$A_2$$, and a force $$F_1 is $$applied to the input piston, what is the output force $$F_2$$?

Accepted Answer

$$F_2$$ = $$F_1$$ \frac{$$A_2$$}{$$A_1$$}$$

Question 4

A manometer measures the pressure difference between a gas and the atmosphere. If the height difference of the fluid column is $$h$$ and the fluid density is $$\rho$$, what is the gauge pressure?

Accepted Answer

$$P = \rho g h$$

Question 5

According to Archimedes’ Principle, the buoyant force on a submerged object is equal to:

Accepted Answer

The weight of the fluid displaced by the object.

Question 6

A pipe narrows from area $$A_1 to$$ $$A_2$$ and the fluid speeds up from $$v_1 to$$ $$v_2. $$According to the equation of continuity, which relationship is correct?

Accepted Answer

$$A_1$$ $$v_1$$ = $$A_2$$ $$v_2$$

Question 7

Bernoulli’s equation for fluid flow along a streamline is:

Accepted Answer

$$P + \frac{1}{2} ho v^2$ + ho g y = 	ext{constant}$$

Question 8

A Venturi tube is used to measure fluid speed. Why is the fluid level higher in the constricted part of the tube?

Accepted Answer

Because the pressure is lower in the constricted part.

Question 9

Which of the following best describes viscosity?

Accepted Answer

A measure of the internal friction between layers of a fluid.

Question 10

A tire pressure gauge reads 32 psi. Is this value absolute or gauge pressure?

Accepted Answer

Gauge pressure.

Question 11

If a fluid is at rest in a container, what must be true about the pressure at all points at the same depth?

Accepted Answer

Pressure is the same at all points at the same depth.

Question 12

A block is fully submerged in water. If the block’s density is greater than water’s density, what is the net force acting on it?

Accepted Answer

Downward, equal to the difference between the block’s weight and the buoyant force.

Question 13

Which of the following is NOT a property of solids?

Accepted Answer

Molecules move freely in random directions.

Question 14

What is the specific gravity of a substance with density $$ho = 2.5 	ext{ g/cm}^3$$?

Accepted Answer

2.5

Question 15

Which device is used to measure blood pressure?

Accepted Answer

Sphygmomanometer

Question 16

A fluid flows through a horizontal pipe that narrows. According to Bernoulli’s principle, what happens to the pressure and speed in the narrow section?

Accepted Answer

Pressure decreases, speed increases.

Question 17

Which of the following is a real-world application of Bernoulli’s principle?

Accepted Answer

The lift force on an airplane wing.

Question 18

If the density of water at $$4^\circC is$$ $$1.000 	ext{ g/cm}^3$$, what is its density in $$	ext{kg/m}^3$$?

Accepted Answer

1000 $$	ext{kg/m}^3$$

Question 19

Which statement about turbulent flow is correct?

Accepted Answer

It is characterized by irregular motion and eddy currents.

Chapter 13: Fluids – Properties, Pressure, and Dynamics

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