Category: Physics

Is too much walking bad for joints? A new study shows that middle-aged men and women who engage in high levels of physical activity — at home and at work as well as at the gym — may be unwittingly damaging their knees and increasing their risk for osteoarthritis. The study involved men and women […]

Why is the gravitational constant important? The constant, G, determines the strength of Newton’s inverse square law in a particular system of physical units and is, not surprisingly, known as Newton’s constant of gravitation. It is considered to be a fundamental constant of nature. Gravity is also by far the weakest force. Who found the […]

How do you stop a fission chain reaction? In the operation of a nuclear reactor, fuel assemblies are put into place and then the control rods are slowly lifted until a chain reaction can just be sustained. As the reaction proceeds, the number of uranium-235 nuclei decreases and fission by-products which absorb neutrons build up. […]

Has anyone hit a homerun in every ballpark? When this question was posed early in 2019, I had given the answer that Mark Reynolds and Curtis Granderson had homered in every MLB ballpark. While the Toddfather is only 32nd on the active career HR list, he has nonetheless managed to homer in every current ballpark […]

How do you heat up gold? Try using a propane torch to melt gold. The gold should be placed into a crucible. Be careful to bring the torch down slowly if you have fine powdered gold in the crucible because you could easily blow it around. With a torch, hold the flame well above the […]

What are the 4 parts of a comet? A comet is made up of four visible parts: the nucleus, the coma, the ion tail, and the dust tail. What are three comets? Astronomers have identified three main parts of a comet: the nucleus, coma and tail. What is the biggest part of a comet? nucleus […]

What are the different types of optical instruments? An optical instrument (or “optic” for short) is a device that processes light waves (or photons), either to enhance an image for viewing or to analyze and determine their characteristic properties. Common examples include periscopes, microscopes, telescopes, and cameras. Is a mirror an optical device? A mirror […]

How do I get rid of dry ice? To dispose of dry ice, place it in a well-ventilated area at room temperature; the remainder of the ice will sublimate away. Never dispose of dry ice in a trash can, chemical waste container or other garbage/waste can. What gas comes off of dry ice? carbon dioxide […]

What is the importance of formulating a hypothesis? A hypothesis enables researchers not only to discover a relationship between variables, but also to predict a relationship based on theoretical guidelines and/or empirical evidence. Developing a hypothesis requires a comprehensive understanding of the research topic and an exhaustive review of previous literature. What is a broader […]

What is the net force of a rock falling at constant terminal velocity? Objects falling through a fluid eventually reach terminal velocity . At terminal velocity, the object moves at a steady speed in a constant direction because the resultant force acting on it is zero. Why does a parachutist does not fall with constant […]