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 […]

Are scientists respected? A new international YouGov survey of more than 22,000 people in 16 countries reveals the most and least respected professions. Coming top of the list are scientists, with an average score of +72 across the 16 countries. How teamwork is important? To have a meaningful and lifelong career, you need to work […]

What are theories based on? Theory basics Theories are concise, coherent, systematic, predictive, and broadly applicable, often integrating and generalizing many hypotheses.” Any scientific theory must be based on a careful and rational examination of the facts. Facts and theories are two different things. Can a theory ever be proved to be absolutely true? But […]

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 […]

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 […]