Category: Physics

Where does government money come from? Most government money comes from: Collecting taxes, or revenue, from people and businesses. Borrowing it by selling Treasury securities (savings bonds, notes, and Treasury bills) Why do we pay taxes and what is it used for? We pay taxes to fund a variety of federal, state, and local services. […]

What are the forces that act on a car? Acting in the opposite direction to the weight is the reaction force. There are two forces acting in opposition to the driving force, the friction with the road and the air resistance. The air resistance is much greater than the friction with the road when a […]

What is the effective far point distance for the human eye? The net focal length of a particular human eye is 1.7 cm. An object is placed at the near point of the eye. How far behind the lens is a focused image formed? The near point is 25 cm from the eye, so the […]

What is an echo what factors are important to get a distinct? The repetition of sound caused by its reflection off a hard surface is known as echo. Factors important to get a distinct echo are: The minimum distance between the source and reflector of sound should be 17 m. The size of reflector must […]

Which invention provided instant communication and information to a massive? Television What invented instant communication? The telephone provided instant communication of the human voice over long distances in synchronous fashion. What is digital TV reception? Digital Television refers to a TV signal that is transmitted digitally as opposed to an analog signal. Digital Television can […]

What is formula for volume of a cube? Volume of a cube = side times side times side. Since each side of a square is the same, it can simply be the length of one side cubed. If a square has one side of 4 inches, the volume would be 4 inches times 4 inches […]

What color would a blue shirt look if you shine red on it? The shirt absorbs red light and reflects blue light. So the red light is absorbed and the blue light is reflected to an observer’s eye. And so the shirt will appear blue. Is Indigo more blue or purple? The truth is, the […]

What can I write instead of I? What is another word for I? I for one I myself for me ourself self the author the speaker the writer me, myself and I myself only What’s a good introduction sentence? The introductory paragraph of any paper, long or short, should start with a sentence that piques […]

How does a rigid rotor work? Rigid rotor is a type of rotor system used on helicopters. The helicopter blades are fixed to the rotor hub without hinges and the hub is fixed to the rotor shaft. The blades of rigid rotor systems are able to flex, which allows the blades freedom to feather but […]

What three things can light rays travel through? The part of optics dealing with the ray aspect of light is called geometric optics. Light can travel in three ways from a source to another location: (1) directly from the source through empty space; (2) through various media; and (3) after being reflected from a mirror. […]