Q: A woman weighing 534 N stands on one heel of her dress shoe with an area of $$1.00 \ \mathrm{cm}^2. $$What is the pressure exerted on the floor? (1 N = 1 kg·m/s², $$1 \ \mathrm{cm}^2 = 1 \times 10$$^{-4}$$ \ \mathrm{m}^2)$$

$$5.34 \times 10^6$ \ \mathrm{N/m}^2$$

Question 1

Which of the following best describes a fluid?

Accepted Answer

A substance that flows and takes the shape of its container.

Question 2

A woman weighing 534 N stands on one heel of her dress shoe with an area of $$1.00 \ \mathrm{cm}^2. $$What is the pressure exerted on the floor? (1 N = 1 kg·m/s², $$1 \ \mathrm{cm}^2 = 1 	imes 10$$^{-4}$$ \ \mathrm{m}^2)$$

Accepted Answer

$$5.34 	imes 10^6$ \ \mathrm{N/m}^2$$

Question 3

Which statement about pressure in a static fluid is correct?

Accepted Answer

Pressure is the same at all points at the same depth in a static fluid.

Question 4

At sea level, the atmospheric pressure is approximately:

Accepted Answer

$$100 \ \mathrm{kPa}$$

Question 5

Why does a balloon expand as it rises up a mountain, as observed in Pascal’s experiment?

Accepted Answer

The external atmospheric pressure decreases with altitude.

Question 6

Pascal’s Principle states that:

Accepted Answer

A change in pressure at any point in a confined fluid is transmitted undiminished throughout the fluid.

Question 7

In a hydraulic lift, the radius of the small piston is $$2.0 \ \mathrm{cm}$$ and the large piston is $$20.0 \ \mathrm{cm}. If a $$force of $$250 \ \mathrm{N} is $$applied to the small piston, what force is exerted by the large piston?

Accepted Answer

$$25,000 \ \mathrm{N}$$

Question 8

The density $$\rho of a $$substance is defined as:

Accepted Answer

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

Question 9

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 10

A block of wood floats on water. Which of the following statements is true?

Accepted Answer

The block displaces a volume of water whose weight equals the weight of the block.

Question 11

Which of the following is NOT a characteristic of an ideal fluid?

Accepted Answer

Turbulent flow

Question 12

The continuity equation for an ideal fluid is:

Accepted Answer

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

Question 13

According to Bernoulli’s Principle, in horizontal flow, where is the pressure higher?

Accepted Answer

Where the speed is lower.

Question 14

A pipe narrows from a cross-sectional area of $$0.05 \ \mathrm{m}^2 to$$ $$0.01 \ \mathrm{m}^2. If $$the velocity in the wider section is $$2 \ \mathrm{m/s}$$, what is the velocity in the narrow section? (Assume incompressible flow.)

Accepted Answer

$$10 \ \mathrm{m/s}$$

Question 15

Which of the following best explains how airplanes achieve lift according to Bernoulli’s Principle?

Accepted Answer

The pressure is lower on top of the wing due to faster airflow.

Question 16

A cube of side $$0.1 \ \mathrm{m} is $$completely submerged in water. If the density of water is $$1000 \ \mathrm{kg/m}^3$$ and $$g = 9.8 \ \mathrm{m/s}^2$$, what is the magnitude of the buoyant force on the cube?

Accepted Answer

$$9.8 \ \mathrm{N}$$

Question 17

Which of the following statements about viscosity is correct?

Accepted Answer

Viscosity is the resistance of a fluid to flow.

Question 18

If the density of oil is $$800 \ \mathrm{kg/m}^3$$ and a $$0.5 \ \mathrm{m}^3$$ block is fully submerged, what is the buoyant force acting on the block? ($$g = 9.8 \ \mathrm{m/s}^2)$$

Accepted Answer

$$3,920 \ \mathrm{N}$$

Question 19

A submarine is designed to have the same average density as seawater. What will happen to the submarine when it is fully submerged?

Accepted Answer

It will remain suspended at any depth.

Fluids: Properties, Pressure, and Applications in Physics

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