Which statement best describes the motion of air particles in a sound wave?
Which statement best describes the motion of air particles in a sound wave?
Explanation: Longitudinal waves have the same direction of vibration as their direction of travel. This means that the movement of the medium is in the same direction as the motion of the wave.
Which statement about sound is true because it is a mechanical wave?
A sound wave transports its energy by means of particle interaction. A sound wave cannot travel through a vacuum. This makes sound a mechanical wave.
Which statement describes how work and power are similar 2 points?
Power ⇒ Work ÷ Time The force and distance will help calculate the work, which will help in the calculation of the power of the object. Hence, the answer is ‘you must known force and distance to calculate both’.
Which best defines energy?
the ability to do work best defines energy!
What are the two main types of energy?
Many forms of energy exist, but they all fall into two basic categories:
- Potential energy.
- Kinetic energy.
What best defines the relationship between work and energy?
Which statement best defines the relationship between work and energy? Work can transfer energy between objects and cause a change in the form of energy. When a spring is compressed, the energy changes from kinetic to potential.
What is the relationship between energy work and force?
The principle of work and kinetic energy (also known as the work-energy theorem) states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle.
Which is occurring when work is being done energy is being reverted?
According to the principle of work-energy a change in the kinetic energy is equivalent to the net work don e by the object. Therefore, when work is being done energy is being transferred from one point to another.
What kind of energy involves the flow of positive charges?
Electrical
What kind of energy is the sun?
Also known as light energy or electromagnetic energy, radiant energy is a type of kinetic energy that travels in waves. Examples include the energy from the sun, x-rays, and radio waves.
Which two types of potential energies would be types of mechanical energy?
There are two main types of mechanical energy. They are motion energy and stored mechanical energy.
Which form of energy has both a positive and a negative charge?
electrical potential energy
What are positive and negative charges?
There are two types of electric charge: positive and negative (commonly carried by protons and electrons respectively). Like charges repel each other and unlike charges attract each other. In ordinary matter, negative charge is carried by electrons, and positive charge is carried by the protons in the nuclei of atoms.
Why is potential energy negative?
Gravitational potential energy is negative at the surface of Earth, because work is done by the gravitational field in bringing a mass from infinity i.e work has to be done on a body, if it is taken away from the gravitational field of the earth. Thus, potential energy is negative.
What are the 3 methods of charging explain?
There are three ways to charge an object: friction, conduction and induction. Friction involves rubbing on material with another, resulting in electrons moving from one surface to another.
What are the 2 types of charges?
Electric charges are of two general types: positive and negative. Two objects that have an excess of one type of charge exert a force of repulsion on each other when relatively close together.
What are the three methods of charging a body?
There are three methods to charge a body, namely, charging by friction, conduction and induction.
What are 2 ways to charge an object?
There are three methods by which charges can be transferred to build up static electricity: charging by friction, by conduction, and by induction. Charging by Friction When two uncharged objects rub together, some electrons from one object can move onto the other object.
How do you create a positive charge?
An electrical charge is created when electrons are transferred to or removed from an object. Because electrons have a negative charge, when they are added to an object, it becomes negatively charged. When electrons are removed from an object, it becomes positively charged.
What is an Electroscope?
Electroscope, instrument for detecting the presence of an electric charge or of ionizing radiation, usually consisting of a pair of thin gold leaves suspended from an electrical conductor that leads to the outside of an insulating container.
What are the types of Electroscope?
An electroscope is a scientific instrument that is used to detect the presence and magnitude of electric charge on a body. There are three classical types of electroscopes: pith-ball electroscope (first), gold-leaf electroscope (second), and needle electroscope (third).
What is the working of Electroscope?
WORKING OF AN ELECTROSCOPE : In an uncharged electroscope, the leaves hang straight down. When a charged object touches the metal knob, electric charges travel down the rod and into the leaves. The leaves spread apart, indicating the presence of an electric charge.
What is the principle of Electroscope?
The working principle of an electroscope is based on the atomic structure of elements, charge induction, the internal structure of metal elements and the idea that like charges repel each other while unlike charges attract each other.
What are the advantages of an Electroscope?
The electroscope, above, has two advantages against the versorium. The spacing of the leaves increases with the quantity of charges. As it is charged, this spacing changes accordind to the sign of the new charges.
What is the working principle of a gold-leaf Electroscope?
A gold-leaf electroscope is a simple device which is used to identify the electric charge present in a body. Their operation is based on the principle of like sign charge repulsion. When the leaves, which are electrically connected, become electrically charged, they push apart from each other.
What are the essential parts of an Electroscope?
An electroscope consists of essentially three components: A charging plate A metal rod Hanging foilAll three of these components are connected and all three are conducting. Charge can move throughout the entire electroscope, from one component to another.
Why gold leaves are used in Electroscope?
Gold is a malleable metal which can be hammered into extremely thin and light sheets. A light gold leaf G is attached to the lower end of the rod. If the electroscope is positively charged by touching the plate with a positively charged glass rod, G will be repelled from R, because both now carry a positive charge.
Can one thundercloud contain both positive and negative charges?
An object with an unknown charge is brought close to the electroscope. Can one thundercloud contain both positive and negative charge? Yes. A thundercloud has a negative charge, and an object on the ground as a positive charge.
What is an Electroscope give its two uses?
The electroscope is an early scientific instrument used to detect the presence of electric charge on a body. It detects charge by the movement of a test object due to the Coulomb electrostatic force on it. The amount of charge on an object is proportional to its voltage.