Physic Flashcards
(28 cards)
What is the effect of the decrease in pressure with the increase in speed of the fluid in a horizontal pipe called?
Venturi effect
The Venturi effect is a principle in fluid dynamics that describes how the pressure of a fluid decreases as its velocity increases when flowing through a constriction.
What principle leads to Bernoulli’s equation?
The principles of conservation of mechanical energy
What does Bernoulli’s equation express?
P + pv’t + pgh = constant
In Bernoulli’s equation, what does ‘P’ represent?
Pressure
In Bernoulli’s equation, what does ‘p’ represent?
Density of the fluid
In Bernoulli’s equation, what does ‘v’ represent?
Velocity of the fluid
In Bernoulli’s equation, what does ‘t’ represent?
Time
In Bernoulli’s equation, what does ‘h’ represent?
Height above a reference point
What type of fluid does Bernoulli’s equation apply to?
Ideal fluid
Fill in the blank: Bernoulli’s equation states that P + _______ + pgh = constant.
pv’t
True or False: Bernoulli’s equation is derived from the conservation of mechanical energy.
True
What is viscosity in the context of fluid dynamics?
Viscosity measures how much force is required to slide one layer of the liquid over another layer.
Viscosity describes the frictional effect between different layers of a flowing fluid.
What do large coefficients of viscosity indicate about a substance?
Substances that do not flow easily, such as thick tar and honey, have large coefficients of viscosity.
Large coefficients of viscosity are usually denoted by the Greek letter ‘η’.
What do small coefficients of viscosity indicate about a substance?
Substances that flow easily, like water, have small coefficients of viscosity.
True or False: All fluids have zero viscosity.
False.
Liquids and gases have non-zero viscosity.
Fill in the blank: A force is required if an object is to be moved through _______.
liquids and gases.
What is the outer radius of the spacecraft denoted as?
R
What does the spacecraft rotate around?
Its own central axis
What is the angular speed of the spacecraft represented by?
o
What does the angular acceleration of the spacecraft equal to?
o
What is the relationship between frequency f and the period T?
f = 1/T
What does the period of revolution of the spaceship denote?
T
What is the formula that relates angular speed and frequency?
o = 2πf
What condition is met when the frequency f is increased such that a, equals g?
Artificial gravity like Earth is provided
