the most elusive particles to detect. They do not emit or absorb any light like a normal matter, making them invisible in dark space. Dark matter till this day have not been discovered yet, but scientists know they exist because it emits some gravitational pull on galaxies. Around the world many scientists
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Tides The Earth’s waters move back and forth every-day, causing currents and tides. Tides are the daily or twice daily rise and fall of the oceans. Tides are caused by the gravitational pull of the moon and sun on the ocean. The rise and fall of tides causes water to move in and out of estuaries, bays and harbors. This movement is called a tidal current. When the tide is rising, water flows from the ocean into the bay creating a flood current. When the tide falls, water flows from the bay back
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object. The momentum of the object is zero. No work is being done on the object. 2213-6507 – 3 – 4. M13/4/PHYSI/HPM/ENG/TZ1/XX Object A of mass m is lifted through a height h. Object B of mass 2m is lifted through a height 4h. The gravitational field is constant over the height interval. What is the ratio work done against gravity on object B ? work done against gravity on object A A. B. C. D. 1 2 4 8 5. A horizontal disc is rotating about a vertical axis through its centre
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Waves are up and down movements, caused by the action of winds on the water surfaces. Waves move in the direction of winds. When ocean levels rise and fall at regualr intervals during the course of the day. This is referred to as the tide. Tides are caused by the gravitational attraction between the moon and the Earth. The horizontal and vertical circulation of ocean waters creates currents. Major causes of ocean currents are wind, friction, gravity, and variations in water density in different
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Astronomy Notes: People & Accomplishments: Plato (428/7 B.C.E. – 328/7 B.C.E.) – Greek Philosopher, a student of Socrates, and teacher of Aristotle. Taught of the “World of Forms;” the idea that the material world (the earth) is made of nothing but imperfect copies of what was imagined to be perfect. Also, the perfect World of Forms (heavens) was where ideas, thoughts, concepts, imagination, reason, etc. exists. The seven planets ((in order; Sun, Moon, Mars, Mercury, Jupiter, Venus, and Saturn)
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that area caused by the wind and there are two kinds: oscillation and translation a) Tides c) Oceanic streams b) Tsunamis d) Waves 10. These are periodical movements of seawater in which the ascends (high) or descends (low) and that are caused by conjoined action of gravitational pulls of the Sun, Moon and Earth. a) Tides c) Oceanic streams b) Tsunamis d) Waves 11. These are large horizontal fluxes of seawater that move
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Life Cycle of Stars The Birth of a Star In space, there exists huge clouds of gas and dust. These clouds consist of hydrogen and helium, and are the birthplaces of new stars. Gravity causes these clouds to shrink and become warmer. The body starts to collapse under its own gravity, and the temperature inside rises. After the temperature reaches several thousand degrees, the hydrogen molecules are ionized (electrons are stripped from them), and they become single protons. The contraction of the gas
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* What does that mean? * Theory: Explanation * Atomic: Of atoms * How did we develop this theory? * Began with the Greeks * Democritus- 470-380 B.C. * Matter cannot be broken down indefinitely. At some point you end up with a piece that cannot be divided. That smallest piece he called an atom, from the Greek word atomos, which means “indivisible” * All matter is composed of atoms, which are bits of matter too small to be seen. These atoms
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as described by the second law of thermodynamics. Heat convection occurs when bulk flow of a fluid (gas or liquid) carries heat along with the flow of matter in the fluid. The flow of fluid may be forced by external processes, or sometimes (in gravitational fields) by buoyancy forces caused when thermal energy expands the fluid (for example in a fire plume), thus influencing its own transfer. The latter process is often called "natural convection". All convective processes also move heat partly by
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Earth Dynamic Ocean & Atmosphere Mylani Tiopan GLG/150 02/02/2015 Suzanne McIninch University of Phoenix Material Earth’s Dynamic Ocean and Atmosphere I Worksheet From Visualizing Earth Science, by Merali, Z., and Skinner, B. J, 2009, Hoboken, NJ: Wiley. Copyright 2009 by Wiley. Adapted with permission. 1 Part 1 Sections 12.1 and 12.2 of the text discuss the origin and composition of the world ocean’s seawater. What is the current theory on the evolution
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