Is it better to insulate walls or roof? If you were on a very skinny budget and had to make a choice, you would insulate your ceiling first. Installing ceiling insulation can save around 35% on heating and cooling energy. Compare this to insulating your walls. Insulating your walls saves around 15% on heating and […]
What is the direction of velocity in circular motion?
What is the direction of velocity in circular motion? We will see that unlike linear motion, where velocity and acceleration are directed along the line of motion, in circular motion the direction of velocity is always tangent to the circle. This means that as the object moves in a circle, the direction of the velocity […]
Is the inside of a battery dangerous?
Is the inside of a battery dangerous? Battery leakage (commonly known as battery acid) is nasty, corrosive stuff – it can burn your skin, contaminate soil, and of course ruin whatever device it has leaked into. For lead batteries, sulfuric acid is the dangerous residue, which requires a different type of clean-up. What is inside […]
What is the formula for relative speed?
Is it safe to zipline?
Is it safe to zipline? Researchers at Ohio State University found that almost 12 percent of zip-line injuries resulted in fractures or other injuries requiring hospitalization, making zip-lining mishaps at least as serious as rock climbing. Has anyone died on a zipline? There have been fatal zip-line crashes in the U.S., including two in Utah, […]
What does tidal heating cause?
What does tidal heating cause? The more the tidal force changes, the more the moon stretches, and the more it heats. This heat causes activity like volcanoes and geysers and can keep water liquid to form oceans. Why is tidal heating important? Tidal heating is responsible for the geologic activity of the most volcanically active […]
Is unexpected color change physical or chemical?
Is unexpected color change physical or chemical? Whatever the reaction, it’s important to recognize that one or more new substances are formed! Burning wood is a common example of a chemical reaction because as the wood reacts with oxygen after it has been ignited, it creates smoke and ashes. Signs of a chemical reaction include: […]
Is electricity and magnetism the same?
Is electricity and magnetism the same? 3) Electricity and magnetism are essentially two aspects of the same thing, because a changing electric field creates a magnetic field, and a changing magnetic field creates an electric field. (This is why physicists usually refer to “electromagnetism” or “electromagnetic” forces together, rather than separately.) How can we prevent […]
Can you use a 50mm lens for macro?
Can you use a 50mm lens for macro? 50mm lenses work best in capturing typical macro shots. However, these types of macro lenses have their drawbacks. 50mm lenses make subjects appear half “life-size” since they usually feature a 1:2 ratio, and require shooting at a much closer distance. But a 50mm lens is a must […]
Is filtered water a pure or impure substance?
Is filtered water a pure or impure substance? Water is a pure substance because it only contains one type of molecule. Pure water contains only molecules that are a combination of one oxygen atom… Is oxygen pure or impure? Air is a mixture of gasses, including nitrogen, oxygen, carbon dioxide and water vapour, as such […]