- Calculate the change in internal energy (Delta U) for a system that is giving off 50.0 kJ of heat and is performing 855 J of work on the surroundings. 49.1 kJ 9.00times 10^2kJ -49.1kJ -50.9kJ -9.00times 10^2kJ
- Clark Benson At one time or another, we have all pressed our hands against a window and looked through a pane of glass to view the world outside (or the world inside the glass). Most of us don't give much thought to the amazing substance known as glass. Glass used in windowpanes is usually either translucent or transparent. Translucer t glass allows light to pass through but with significant diffusion or distortion. Stained glass windows are made of translucent glass. Transparent, or clear, glass has no distortion This allows people to see through the glass without any trouble. Technical advances let people produce glass in many colors, shapes, and sizes for a variety of uses. However, Mother Nature creates glass without any outside help. Natural glass forms in several different ways. Whether formed naturally or through manufacturing, the most common way of making glass is to superheat silico or quartzite sand to its melting point. The sand along shorelines and beaches contains these two materials, After the crushed quartzite or silica is superheated into a liquid form, it cools to form a clear, hard substance. This is glass. Scientists consider glass an amorphous substance. This means it is not truly a sold or a liquid. It exists in a state somewhere in between. Though the molecules that make up glass have a messy arrangement they still manage to bond together and become stift. Glass reaches this state once It has cooled after introduction to intense heat In fact, the opposite is also true. Introducing a piece of glass to extreme heat can return it to a liquid feem. "Though this explains how glass foems, you might still be wondering how this takes place in nature. Lightning is one way that glass can form in a natural setting. When a bolt of lightning hits a sandy patch of soi, it can create natural pieces of glass called fulgurites. This occurs in much the same way as we create glass synthetically.In this case, though. the bolt of lightning creates the extreme heat needed to form glass. "Glass also forms naturally when lava bursts from a volcano and then cools.The melting lava creates tremendous amounts of heat. It would then make sense that a natural byproduct of the fiery volcanic explosions is a glass formation called obsidian Obsidian is a beautiful, natural spectacle Known for its shiny black, orange, gray, or green color, it was surely the earliest type of glass used by prehistoric societies. It often forms when lava spews into the sea and the water cools the lava into hard volcaric glass. Unlike translucent glass, obsidian is usually opaque. This means you cannot see through this type of glass. It was through these natural events that people discovered the amazing substance known as glass. After its discovery, people began manufacturing glass and using it for many practical and artistic purposes.Today, glass is an important part of our everyday lives. Just look through any window! 4x Which sentence from the passage is the BEST example of the author's attempt to develop interest and engage his audience? A Glass also forms naturally when lava bursts from a volcano and then cools. B It would then make sense that a natural byproduct of the fiery volcanic explosions is a glass formation called obsidian. At one time or another, we have all pressed our hands against a window and looked through a pane of glass to view the world outside... Whether formed naturally or through manufacturing, the most common way of making glass is to superheat silica or quartzite sand to its melting point.
- 7. The Milky Way galaxy is best described a: A. a type of solar system B. a constellation visible to everyone on l C. a region in space between the orbits c and Jupiter D. a spiral-shaped formation composed of of stars
- What is Potential Energy? ¿Qué es la energia potencial? Energy of motion /Energia de movimiento Stored energy based on height / Energia almacenada según la altura. Energy of heat/energia del calor Energy from friction / Energia de la fricción
- 7. A standing wave is produced by reflecting a wave off a wall (which acts Eke a foced end). If the wave consists of 6 anti-nodes and 7 nodes and the wall is 12m away from the source. determine the wavelength.
