domingo, 29 de marzo de 2009
letter 2070
I think that now we must begin to take care of our planet that we want to stay no more adente without water or better than ever, we will spend what is supposed to happen in 2070 that the losers will be our children. Also paresce me that the president of each country to propose a campaign to ensure the most planeta.Y obviously people need help for us
WHAT IS MATTER?
Every thingthat surrouns us is made up of matter. The air, animals, rocks, plants every thing.We cout define matter as all that occupies a space and can be weighed. Even gases wich are very light, can be weighedif we weigh and inflated balloon we can see that it weighs slightly more than an un. inflated balloon. When we are studing matter we use sam basic quantities such as length, surface, area, volume, mass, density or temperature. So that we are all using the same units in science we use what is called the internationalsystem of units.
DIMENSIONS: Length (L) is the distance betteen two bodies.In (SI) units this is mesured in meters(M) we also use centimeter(CM) or kilometers (KM) we use rulers, measuring tapes and so on when we are measuring length (L).
SURFACE AREA (S): Is the space occupied by two dimensions length (L) and width. In (SI) units we measure surface area in square meters (M2) and other very common unit is square centimeters (CM2).
VOLUME (V): Is total space ocupied by a body. It is often measured in litres even in the (SI) unit in the cubic meter (M3) the volume of liquids or solids can be measured using measuring cylinders in the case of regular geometric chapes we can use mathematical formules for example:the volume of a sphere with radius is Vsphere =4/3 valius of PI R3.
DIMENSIONS: Length (L) is the distance betteen two bodies.In (SI) units this is mesured in meters(M) we also use centimeter(CM) or kilometers (KM) we use rulers, measuring tapes and so on when we are measuring length (L).
SURFACE AREA (S): Is the space occupied by two dimensions length (L) and width. In (SI) units we measure surface area in square meters (M2) and other very common unit is square centimeters (CM2).
VOLUME (V): Is total space ocupied by a body. It is often measured in litres even in the (SI) unit in the cubic meter (M3) the volume of liquids or solids can be measured using measuring cylinders in the case of regular geometric chapes we can use mathematical formules for example:the volume of a sphere with radius is Vsphere =4/3 valius of PI R3.
lunes, 16 de marzo de 2009
ALTERNATIVE SOURCES OF ENERGY
Solar energy is one the most resourceful sources of energy for the future. One of the reasons for this is that the total energy we recieve each year from the sun is around 35,000 times the total energy used by man. However, about 1/3 of this energy is either absorbed by the outer atmosphere or reflected back into space (a proccess called albedo)1.
Solar energy is presently being used on a smaller scale in furnaces for homes and to heat up swimming pools. On a larger scale use, solar energy could be used to run cars, power plants, and space ships (like the picture you see above) .
Wind Power
Wind power is another alternative energy source that could be used without producing by-products that are harmful to nature. Like solar power, harnessing the wind is highly dependent upon weather and location. The average wind velocity of Earth is around 9 m/sec. And the power that could be produced when a wind mill is facing the wind of 10 mi/hr. is around 50 watts.1
What is GEOTHERMAL ENERGY ???
Geothermal energy is an alternative energy source, although it is not resourceful enough to replace more than a minor amount of the future's energy needs. Geothermal energy is obtained from the internal heat of the planet and can be used to generate steam to run a steam turbine. This in turn generates electricity, which is a very useful form of energy.
Tidal Power
Even the power of the tides can be harnessed to produce electricity.
Similar to the more conventional hydroelectric dams, the tidal process utilizes the natural motion of the tides to fill reservoirs, which are then slowly discharged through electricity-producing turbines. The former USSR produced 300 MW in its Lumkara plant using this method.
Hydroelectricity
Hydroelectricity comes from the damming of rivers and utilizing the potential energy stored in the water. As the water stored behind a dam is released at high pressure, its kinetic energy is transferred onto turbine blades and used to generate electricity. This system has enormous costs up front, but has relatively low maintenance costs and provides power quite cheaply. In the United States approximately 180,000 MW of hydroelectric power potential is available, and about a third of that is currently being harnessed.
Solar energy is presently being used on a smaller scale in furnaces for homes and to heat up swimming pools. On a larger scale use, solar energy could be used to run cars, power plants, and space ships (like the picture you see above) .
Wind Power
Wind power is another alternative energy source that could be used without producing by-products that are harmful to nature. Like solar power, harnessing the wind is highly dependent upon weather and location. The average wind velocity of Earth is around 9 m/sec. And the power that could be produced when a wind mill is facing the wind of 10 mi/hr. is around 50 watts.1
What is GEOTHERMAL ENERGY ???
Geothermal energy is an alternative energy source, although it is not resourceful enough to replace more than a minor amount of the future's energy needs. Geothermal energy is obtained from the internal heat of the planet and can be used to generate steam to run a steam turbine. This in turn generates electricity, which is a very useful form of energy.
Tidal Power
Even the power of the tides can be harnessed to produce electricity.
Similar to the more conventional hydroelectric dams, the tidal process utilizes the natural motion of the tides to fill reservoirs, which are then slowly discharged through electricity-producing turbines. The former USSR produced 300 MW in its Lumkara plant using this method.
Hydroelectricity
Hydroelectricity comes from the damming of rivers and utilizing the potential energy stored in the water. As the water stored behind a dam is released at high pressure, its kinetic energy is transferred onto turbine blades and used to generate electricity. This system has enormous costs up front, but has relatively low maintenance costs and provides power quite cheaply. In the United States approximately 180,000 MW of hydroelectric power potential is available, and about a third of that is currently being harnessed.
domingo, 15 de marzo de 2009
ENERGY SOURCES
throughout history people have obtained energy fromm their own muscles, animals, the wind, running water, several types of fuel. wood, coal, oil, petroleum,etc. and electricity of course traditional sources of energy are still being used.
EXAMPLE:
muscular energy in order to carry out certain tasks animals for pulling cards ploughing the land in developing countris; air currents for sailing boats,wind farms; running water for hydroelectric power stations, river boats; fuel for cars, gas or coal boilers; electricity for household electrical appliances, industrial machinary.
EXAMPLE:
muscular energy in order to carry out certain tasks animals for pulling cards ploughing the land in developing countris; air currents for sailing boats,wind farms; running water for hydroelectric power stations, river boats; fuel for cars, gas or coal boilers; electricity for household electrical appliances, industrial machinary.
viernes, 13 de marzo de 2009
martes, 10 de marzo de 2009
types of energy
The chemical energy is a manifestation of energy. Specifically,
is one aspect of the internal energy of a body and, while en -
always finds in this area, we are only displayed when there is a
intimal alteration of it.
In ctualidad, chemical energy is what moves cars,
ships and aircraft and, in general, millions of machines. The fuel
tion of coal, wood or oil in steam engines as the
of petroleum products and reduced in the narrow space of the cylin -
tables of an engine explosion, are chemical reactions.
The heat energy that is holding the bodies, when they are exposed to the influence of heat. Also, one can say which is the energy that is transmitted between two bodies that are at different temperatures, ie with different calorie levels.
Heat is a form of energy that is in constant transit. This means that if a body is at a certain level of calories, the heat is transferred to the environment. You can see what happens when two bodies come into contact, with a colder than the other. In this case, warm body heat is transmitted to the body cool, until both acquire the same temperature.
Electricity
Electricity is called a form of energy that results from the existence of a potential difference between two points, which allows an electric current between them when they are in contact through an electrical conductor, and obtain work. Electrical energy can be transformed into many other forms of energy such as light energy or light, mechanical power and thermal power.
Its use is one of the foundations of the technology used by man in the act
The kinetic energy of a body is an energy that arises in the phenomenon of movement. Is defined as the work required to accelerate a given mass of a body from its position of equilibrium to a given speed. Having gained this energy during acceleration, the body maintains its kinetic energy regardless of the change of speed. Negative work of the same magnitude might be required for the body to return to its steady state.
sound energy
In physics, noise is anything that involves the propagation of elastic waves in a nearly audible or audible, usually through a fluid (or elastic) that generate vibration of a body. The sound is humanly audible sound waves consist of oscillations of air pressure, which are converted into mechanical waves in the human ear and perceived by the brain. Sound propagation is similar in the fluid, where sound takes the form of pressure fluctuations. In the solid sound propagation involves changes in the tensional state of the environment
The light (from the Latin lux Lucis) is the kind of radiant electromagnetic energy capable of being perceived by the human eye. In a broader sense, the term light includes the entire range of radiation called the electromagnetic spectrum. The science that studies the major ways to produce electricity, as well as their control and applications, is called optical.
is one aspect of the internal energy of a body and, while en -
always finds in this area, we are only displayed when there is a
intimal alteration of it.
In ctualidad, chemical energy is what moves cars,
ships and aircraft and, in general, millions of machines. The fuel
tion of coal, wood or oil in steam engines as the
of petroleum products and reduced in the narrow space of the cylin -
tables of an engine explosion, are chemical reactions.
The heat energy that is holding the bodies, when they are exposed to the influence of heat. Also, one can say which is the energy that is transmitted between two bodies that are at different temperatures, ie with different calorie levels.
Heat is a form of energy that is in constant transit. This means that if a body is at a certain level of calories, the heat is transferred to the environment. You can see what happens when two bodies come into contact, with a colder than the other. In this case, warm body heat is transmitted to the body cool, until both acquire the same temperature.
Electricity
Electricity is called a form of energy that results from the existence of a potential difference between two points, which allows an electric current between them when they are in contact through an electrical conductor, and obtain work. Electrical energy can be transformed into many other forms of energy such as light energy or light, mechanical power and thermal power.
Its use is one of the foundations of the technology used by man in the act
The kinetic energy of a body is an energy that arises in the phenomenon of movement. Is defined as the work required to accelerate a given mass of a body from its position of equilibrium to a given speed. Having gained this energy during acceleration, the body maintains its kinetic energy regardless of the change of speed. Negative work of the same magnitude might be required for the body to return to its steady state.
sound energy
In physics, noise is anything that involves the propagation of elastic waves in a nearly audible or audible, usually through a fluid (or elastic) that generate vibration of a body. The sound is humanly audible sound waves consist of oscillations of air pressure, which are converted into mechanical waves in the human ear and perceived by the brain. Sound propagation is similar in the fluid, where sound takes the form of pressure fluctuations. In the solid sound propagation involves changes in the tensional state of the environment
The light (from the Latin lux Lucis) is the kind of radiant electromagnetic energy capable of being perceived by the human eye. In a broader sense, the term light includes the entire range of radiation called the electromagnetic spectrum. The science that studies the major ways to produce electricity, as well as their control and applications, is called optical.
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