What is a trefoil symbol? A trefoil (from the Latin trifolium, “three-leaved plant”) is a graphic form composed of the outline of three overlapping rings, used in architecture and Christian symbolism, among other areas. The term is also applied to other symbols with a threefold shape. A similar shape with four rings is called a […]
Does the sign of the acceleration alone tell you whether an object is speeding up or slowing down?
Does the sign of the acceleration alone tell you whether an object is speeding up or slowing down? Another way to say this is that if the acceleration has the same sign as the velocity, the object will be speeding up. And if the acceleration has the opposite sign as the velocity, the object will […]
Should you do easy or hard homework first?
Should you do easy or hard homework first? If you are easily frustrated and are quick to feel overwhelmed when things get tough, then perhaps you’re the type of person who should tackle the small, quick homework assignments first. In school, start your afternoons by completing the easiest assignments: doing so will motivate you to […]
What materials are transparent to radio waves?
What materials are transparent to radio waves? RF transparent materials are materials where RF fields can penetrate with no heating happen. So far, I know some like Teflon, PPL, PVC, and ABS. They are made of plastics and have almost 0 dielectric loss factor. Is Fiberglass transparent to radio waves? An excellent insulator, fiberglass has […]
What is the atomic mass of Mg2+?
What is the mass number and charge of the emitted positron?
What is the purpose of dark matter?
What is the purpose of dark matter? [+] Dark matter is the most mysterious, non-interacting substance in the Universe. Its gravitational effects are necessary to explain the rotation of galaxies, the motions of clusters, and the largest scale-structure in the entire Universe. Can we see dark matter? Although we cannot see dark matter and we […]
What causes light beams to be parallel?
What causes light beams to be parallel? A narrower beam of laser light spreads out more quickly than a wider beam. Only an infinitely wide beam (a plane wave) does not spread out, and therefore has parallel waves. Divergence is observed by shining a laser light on a wall and then seeing the spot grow […]
Do electrons physically move?
Do electrons physically move? Electrons do physically move when a voltage is applied – extremely slowly. This works out to 8.4 cm/hour. Can an electron move? Because an electron is a quantum object with wave-like properties, it must always be vibrating at some frequency. Furthermore, an electron in a stable atomic state does not move […]
How do you tell if you have had a seizure?
How do you tell if you have had a seizure? General symptoms or warning signs of a seizure can include: Staring. Jerking movements of the arms and legs. Stiffening of the body. Loss of consciousness. Breathing problems or stopping breathing. Loss of bowel or bladder control. Falling suddenly for no apparent reason, especially when associated […]