... because, as a star burns fuel, it creates an outward push, which counteracts the inward pull of gravity. Once the fuel is gone, the internal pressure of the star drops and it can no longer support its own weight. In a monstrous explosion, the outer layers are thrown off. And, at this same moment, the core collapses. This can happen rather quickly because gravity can crush an object 10,000 miles across to an object only 10 miles across in about one second. During the time that a black hole is created, the star shrinks down to an infinitely small and infinitely dense point know as the singularity. At this point, all we have ever known about the universe bre ...
... metal. It is an unusual metal in its color, Luster, malleability and it can with stand corrosion. "By at least the fourth millennium BC, gold was found through both placer and vein(lode) mining and by the time of the early cultures from which modern civilization is descended the search for gold was wide spread"(Green 1968). Gold is mainly extracted through mining. It is mainly found in tiny flakes or sands but sometimes is found in nuggets. The largest nugget ever found weighed eight kilograms. "Gold deposits are usually classified as lode, placer, massive or disseminated types" (Colliers Encyclopedia). "Lode deposits are mostly associated with acidic ingeno ...
... similar to how gasoline cars work, with the alternator using the engine's power to recharge the battery. After the power supply is replenished the gasoline engine shuts down. Also the gasoline engine is used to power the vehicle as it reaches the higher speeds where the added horsepower is needed. Usually the speed at which the gasoline engine starts is in the 30 mile per hour range. Even as the gasoline engine runs the electric motor continues to provide power for the vehicle. This vehicle combination in my opinion is beneficial economically and environmentally. There are many benefits for the hybrid vehicle. The price of hybrid cars present day is near seventeen ...
... subterranean caverns" (Matthys 87). However, with modern technology we found that what actually causes is tectonic plates which on average move only two inches per year they are driven by convection currents which is the upward movement of heated particles rising from the earth's molten core. As the plates are driven against each other one will try to and eventually will slip underneath the other. When plates move quickly an earthquake is the result. Before the availability of instruments capable of a quantitative measure of their magnitude, were classified according to their intensity. In 1931 a seismologist came up with twelve degrees of intensity rangin ...
... always be careful when working with sharp objects. 7. An electrical plug symbol means that you will be using electricity in your lab. Never touch an electrical socket or appliance with wet hands. 8. The symbol that looks like a duck means that you will be working with live animals. Analysis and Conclusion: 1. The person is not wearing safety goggles and he isn't really paying close attention. Safety goggles are vital when you are working with fire. 2. She is pointing the vial towards herself. Whenever you are working with heating liquids, the vial should never pointing towards you. 3. The person is heating a liquid with a top on the beaker. Whenever you ...
... reacts with metals to form chlorides, most of which are soluble in water. Chlorine also reacts directly with many nonmetals such as sulfur, phosphorus, and other halogens. Chlorine can support combustion; if a candle were to be thrown into a vessel of chlorine, it would continue to burn, releasing dense, black clouds of smoke, The chlorine combines with hydrogen of the paraffin, forming hydrogen chloride, and uncombined carbon is left in the form of soot. Soot is black residue from fuel. Chlorine replaces iodine and bromine from their salts. Dry chlorine is somewhat inert or not able to move, but moist chlorine unites directly with most of the elements. Hist ...
... concluded that the deflections of the alpha particles were caused by a center of positive charge that contained most of the atom's mass (the nucleus). He also explained that the particles that went straight through the foil did so because the atom is mostly empty space and that the distance between electrons and the nucleus is vast compared to the size of the nucleus itself. In 1919, he discovered the "artificial disintegration" of nitrogen. His experiments show that under alpha radiation, nitrogen is decomposed and hydrogen is formed. Rutherford also devised an electrical method for counting the number of alpha particles emitted from radioactive substances. ...
... change is a part of the Earth's history. There have been dramatic fluctuations in over all average temperature for the past 150,000 years that suggest a direct association with carbon dioxide levels. In the past the temperature highs and lows have been in tandem with carbon dioxide level highs and lows, this does not seem to be a mere coincidence. Carbon dioxide currently accounts for 0.03% of the gas content within the atmosphere. However, it has a disproportionate impact on the earth's temperature. Thus, minor fluctuations in the percentage of atmospheric carbon dioxide will likely have a significant effect on the global temperature. The percentage of atmospheri ...
... that they form a grove or pocket on the surface. The substrate fits in to this grove, which is the site of reactions catalyzed by the enzyme, or active site. Recent studies of enzyme structure have suggested that the active site is flexible. The binding between and substrate appears to alter the shape of the enzyme. This induces a close fit between the active site and the substrate. It is also believed that this may put some strain on the substrate molecule facilitating the reaction. Another characteristics of are competitive inhibition and non-competitive inhibition. Competitive inhibition is the binding of a competitive molecule to the active site of the e ...
... A given kind of organism may evolve only when it occurs in a variety of forms differing in hereditary traits, that are passed from parent to offspring. By chance, some varieties prove to be ill adapted to their current environment and thus disappear, whereas others prove to be adaptive, and their numbers increase. The elimination of the unfit, or the "survival of the fittest," is known as Natural Selection because it is nature that discards or favors a particular being. Evolution takes place only when natural selection operates on apopulation of organisms containing diverse inheritable forms. HISTORY Pierre Louis Moreau de Maupertuis (1698-1759) ...
