Q: A diver descends to a depth of 3345 m in seawater ($$\rho = 1030\ \mathrm{kg/m^3$}). $$What is the gauge pressure at this depth? ($$g = 9.8\ \mathrm{m/s^2$})$$

$$3.38 \times 10^7$\ \mathrm{Pa}$$

Question 1

Which of the following phases of matter is considered a fluid and can be compressed easily?

Accepted Answer

Gas

Question 2

A hydraulic lift is used to raise a 2000 kg car. The large piston has a diameter of 24 cm, and the small piston has a diameter of 2 cm. What force must be applied to the small piston to lift the car? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$F = 137\ \mathrm{N}$$

Question 3

Which equation correctly expresses the pressure at a depth $$h in a $$fluid of density $$\rho$$ under gravity $$g$$?

Accepted Answer

$$P = \rho g h$$

Question 4

A patient is receiving an intravenous (IV) infusion. If the blood pressure in the vein is 18 mm Hg above atmospheric pressure, and the density of the fluid is $$1.00\ \mathrm{g/cm^3$}$$, at what minimum height above the entry point should the IV bag be placed? ($$1\ \mathrm{mm\ Hg} = 133\ \mathrm{Pa}$$, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$h = 0.24\ \mathrm{m}$$

Question 5

Which of the following statements best describes Pascal's Principle?

Accepted Answer

An external pressure applied to a confined fluid is transmitted undiminished throughout the fluid.

Question 6

A mercury barometer reads a height of 76.0 cm. What is the atmospheric pressure in mm Hg and in kPa? ($$1\ \mathrm{atm} = 101.3\ \mathrm{kPa} = 760\ \mathrm{mm\ Hg})$$

Accepted Answer

$$760\ \mathrm{mm\ Hg}$$ and $$101.3\ \mathrm{kPa}$$

Question 7

Which of the following is the correct SI unit for pressure?

Accepted Answer

$$\mathrm{N/m^2$} ($$Pascal)

Question 8

A diver descends to a depth of 3345 m in seawater ($$\rho = 1030\ \mathrm{kg/m^3$}). $$What is the gauge pressure at this depth? ($$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.38 	imes 10^7$\ \mathrm{Pa}$$

Question 9

Which of the following best defines specific gravity?

Accepted Answer

The ratio of the density of a substance to the density of water at $$4^\circC$$

Question 10

A tire gauge reads 200 kPa. What is the absolute pressure inside the tire? (Atmospheric pressure is $$101.3\ \mathrm{kPa})$$

Accepted Answer

$$301.3\ \mathrm{kPa}$$

Question 11

Which of the following is NOT a fluid?

Accepted Answer

Solid

Question 12

If the area of the output piston in a hydraulic lift is 100 times greater than the input piston, what is the mechanical advantage?

Accepted Answer

100

Question 13

Which of the following is the correct formula for density?

Accepted Answer

$$\rho = \frac{m}{V}$$

Question 14

A manometer is used to measure the pressure of a gas in a container. If the mercury column is 20 mm higher on the open side, what is the gauge pressure of the gas? ($$1\ \mathrm{mm\ Hg} = 133\ \mathrm{Pa})$$

Accepted Answer

$$2660\ \mathrm{Pa}$$

Question 15

Which of the following is a correct conversion for atmospheric pressure?

Accepted Answer

$$1\ \mathrm{atm} = 101,300\ \mathrm{N/m^2$}$$

Question 16

Which property distinguishes a liquid from a gas?

Accepted Answer

A liquid has a definite volume, while a gas does not.

Question 17

A 5-inch thick carbon fiber wall is subjected to a pressure of $$35\ \mathrm{MPa}. If $$the Young's modulus for compression is $$40\ \mathrm{GPa}$$, by how much does the wall compress?

Accepted Answer

$$0.5\ \mathrm{mm}$$

Question 18

Which of the following is a correct statement about gauge pressure?

Accepted Answer

Gauge pressure is the difference between absolute pressure and atmospheric pressure.

Question 19

Which of the following is NOT a classical phase of matter?

Accepted Answer

Liquid crystal

Fluids: Phases, Pressure, and Measurement – Study Notes for College Physics

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