Category: Physics

How dangerous are black holes? These black holes are dark most of the time, but when their gravity pulls in nearby stars and gas, they flare into intense activity and pump out a huge amount of radiation. Massive black holes are dangerous in two ways. If you get too close, the enormous gravity will suck […]

Which mirror Cannot produce virtual image? concave mirror How do you make a virtual image? A virtual image (as opposed to a real image) is produced by an optical system (a combination of lenses and/or mirrors) when light rays from a source do not cross to form an image. Instead they can be ‘traced back’ […]

What are the three main points of collision theory? There are three important parts to collision theory, that reacting substances must collide, that they must collide with enough energy and that they must collide with the correct orientation. What are the 4 main factors that affect the rate of reaction? There are four factors that […]

How hard do you have to pull to keep the crate moving with constant velocity? To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate “breaks loose” and starts to move, you can keep it moving at constant velocity with only 200 N. Is it easier to start […]

Is F MA wrong? 1 states: In fact the law, F=ma is not exactly true; if it were a definition we should have to say that it is always true; but it is not First, because Newton’s Second Law is not exact, and second, because in order to understand physical laws, you must understand that […]

Can I wire lights in series? Series Wiring is “ALL or NONE” type wiring mean all the appliances will work at once or all of them will disconnect if fault occurs at any one of the connected device in series circuit. High supply voltage are needed if we need to add more load (light bulbs, […]

What is the best topic in physics? List Of Some Important Physics Topics Useful For Students Newton’s Laws of Motion. Vectors and Projectiles. Work and Energy. Circular Motion and Gravitation. Electric Circuits. Thermal Physics. Vibrations and Waves. Refraction and Lenses. Which branch of physics is most interesting? Particle physics was another very exciting one….When considering […]

Which is more reactive Fe2+ or Fe3+? In an oxidative solution, Fe2+ will be. In a reductive environment, Fe3+ will be more reactive. Fe3 is more stable than Fe2, so Fe2 is more reactive than Fe3. Is Iron 2 or 3 more common? Properties of Iron. Like other Group 8 elements, iron exists in a […]

What happens to a solid when you remove heat? When heat is removed from a system the heat cools down. If you boil water and you put it in the freezer it will become ice. If you add heat to a solid it becomes a liquid. When you add heat to a liquid it becomes […]

Where does gas exchange occur in the body? During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls […]