Properties of Fluids - Density, Specific Gravity, Viscosity

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What is the standard SI unit of viscosity?

Pound-second per square foot
Poise
Newtonsecond per square meter (correct)
Kilogram per meter-second

What is the difference between dynamic viscosity and kinematic viscosity?

Dynamic viscosity is the measure of a fluid's density, while kinematic viscosity is the measure of its resistance to flow.
Dynamic viscosity is the measure of a fluid's resistance to flow, while kinematic viscosity is the ratio of dynamic viscosity to density. (correct)
Dynamic viscosity is the measure of a fluid's surface tension, while kinematic viscosity is the measure of its compressibility.
Dynamic viscosity is the measure of a fluid's temperature, while kinematic viscosity is the measure of its pressure.

In Example 9, what is the absolute viscosity of water at 68°F in pound-second per square foot?

0.6724 lb-s/ft^2 (correct)
0.01008 lb-s/ft^2
2.11 x 10^-5 lb-s/ft^2
0.01008 poise

In Example 10, what is the kinematic viscosity of water at 68°F?

$3.38 \times 10^{-6}$ ft^2/s (B) Signup and view all the answers

In Example 11, what is the shear stress in the SEA 10 oil at 20°C?

0.0425 lb/ft^2 (C) Signup and view all the answers

What is the specific volume of a fluid with a mass density of 850 kg/m³?

$1.176 \times 10^{-3}$ m³/kg (D) Signup and view all the answers

If a fluid occupies a volume of 18 L and weighs 180 N at a location where the gravitational acceleration is 9.81 m/s², what is its specific gravity?

1.0 (D) Signup and view all the answers

A cylindrical tank of ethanol has a mass of 30 kg and a volume of 40 L. If the gravitational acceleration is 9.81 m/s², what is the force needed to accelerate this tank linearly at 0.2 m/s²?

294 N (B) Signup and view all the answers

A bottle has a mass of 25 g when empty and 75 g when filled with water. When filled with another liquid, the mass is 65 g. What is the specific gravity of this other fluid?

0.67 (C) Signup and view all the answers

If 3 L of an antifreeze solution with a specific gravity of 0.9 is added to 5 L of water to make an 8 L mixture, what is the specific gravity of the mixture?

0.9375 (A) Signup and view all the answers

Viscosity is a property that measures a fluid's ________ to flow.

resistance (D) Signup and view all the answers

What property of a substance is density a measurement of?

How tightly the material is packed together (D) Signup and view all the answers

What is the formula to calculate density?

$\rho = \frac{m}{V}$ (C) Signup and view all the answers

What does a high density for an object indicate?

The object has a lot of matter in a certain volume (B) Signup and view all the answers

In the context provided, what differentiates a solid from a fluid in terms of stress and strain?

A solid's stress is proportional to strain while a fluid's stress is proportional to strain rate (D) Signup and view all the answers

Which substance has a higher density: one with a volume of 1 m³ and mass of 1160 Kg or one with a volume of 0.042 cm³ and mass of 0.14 g?

The one with the volume of 1 m³ and mass of 1160 Kg (B) Signup and view all the answers

If a room has dimensions of 4 m x 5 m x 6 m at 100 kPa and 25°C, what property would be needed to calculate the mass of air in the room?

Density of air at given conditions (D) Signup and view all the answers

What is the standard SI unit of viscosity?

The standard SI unit for viscosity, which represents the resistance of a fluid to flow. It's measured as the force required to move a plate with a unit area across a layer of fluid with a unit velocity gradient.

What is the difference between dynamic viscosity and kinematic viscosity?

Dynamic viscosity measures a fluid's internal resistance to flow, like the force required to move a layer of fluid. Kinematic viscosity is the ratio of dynamic viscosity to density, indicating how easily a fluid flows under gravity.

What is shear stress in a fluid?

The force per unit area acting on a fluid due to the movement of its layers, like sliding a flat surface across a fluid.

What is specific volume?

The reciprocal of the density of a fluid. Represents the volume occupied by a unit mass of the fluid.