First, gravity is a force that causes objects to attract one another. The simplest way to understand gravity is through Isaac Newton's law of universal gravitation. This law states that every particle in the universe attracts every other particle. The more massive an object is, the more strongly it attracts other objects. The closer objects are, the more strongly they attract each other. An enormous object, like the Earth, easily attracts objects that are close to it, like apples hanging from trees. Scientists haven't decided exactly what causes this attraction, but they believe it exists everywhere in the universe. Second, air is a fluid that behaves essentially the same way liquids do. Like liquids, air is made of microscopic particles that move in relation to one another. Air also moves like water does -- in fact, some aerodynamic tests take place underwater instead of in the air. The particles in gasses, like the ones that make up air, are simply farther apart and move faster than the particles in liquids.|The majority of iron ore goes through iron ore processing and is used to make steel. Iron ore processing is a process that contains explosions, shoveling, moving, crushing, grinding, pelletizing etc. Iron ore processing provides a range of coarse sizing which can produce material in 24-inch to .0017-inch particle sizes. In iron ire process, the crushing and screening process is a basic link to concentrator will directly affect the production of indicators. Methods used to include jaw crusher, impact crusher, roll crushing, and pulverizing. In order to make iron ore size as fine as possible before entering into ball mill, iron ore processors are usually use cone crushers in pre-grinding stage, cone crusher have an excellent fine crushing capability to minish iron ore size. In coarse crushing, 2.1m or 2.2m gyratory crusher is often to be selected, in medium crushing process, processer usually use standard cone crusher, and in fine crushing, short-head type cone crusher is suitable. But, if the iron ore is very wet and sticky, the materials usually mean trouble when it comes to crushing and screening processes. A four-minute miler runs 15 mph (24 kph). So, on paper, the T. rex is going to crush the average human in a race. But as long as we're playing this suspension of disbelief game, let's be "realistic" here. You're not going to be running a friendly race against this T. rex. You're going to be running for your life. In a predator/prey scenario, your relatively tiny size gives you the advantage. The T. rex has you beat in pure speed, but even if you were racing from a starting line, you'd have a healthy lead before the dinosaur even got its massive body into proper running position. If you were just wandering around in Dinosaurland, you'd likely see the T. rex coming way before it sees you, so you'd again have a good head start. Once it's spotted you and started the chase, the T. rex would gain on you fast, given its relatively enormous stride.
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