science

BABY: THE FIRST NINE MONTHS

2009-08-25T15:24:00.000-07:00

We are used to thinking of a baby being age 0 on the dayit is born. But it has been growing for about nine months before it enterw the Word. This is what happens in the nine months (38 weeks) before is born.

WEEK 0: Egg is fertilised in the tube.

WEEK 1 : Embryo becones atached to the womb.

WEEK 2: Embryo ‘s eyes Begin to develop . Its legsand arms are tiny bumps.

WEEK 6 : Embryo begins to look like a human. Ears, hands and feet begings to grow. Heart

WEEK 10 : Baby’s finger and toes grow, it can move its arms and legs a little. It can even swallow.

WEEK 14: If doctors could see the baby, they could tell if it was a boy or a girl.

WEEK 18: Baby hás hair eyebrows.Doctors can hear its heart beat. It can have ... mother begins to feel its kicks.

WEEK 26 : Baby open its eyes.WEEK 30 : If born now, the baby could live with especial care .

WEEK 34 : Baby has grown a lot of fat in the last four weeks to keeps it warm when it is born.

WEEK 38 : Baby is born.

2009-08-20T14:11:00.000-07:00

what is an egg ?

In some animals, an egg is a rounded body, varying in size and hardness, which produce females, and supports and protects the embryo if the egg is fertilized, thus becoming zygote.

when the baby is in the wonb

how does it get food and oxygen

what are contractions?

The uterus is an organ primarily composed of muscle tissue. Like any muscle contractile activity has throughout his life, within and outside of pregnancy but usually this is not perceived by women.

how is a baby born

An infant or newborn is a baby who has 27 days or less from birth, either by birth or by cesárea.1 2 The definition of this period is important because it represents a very short life, but it rapid changes occur that can result in significant consequences for the rest of the life of the newborn.

why does the growing embryo depend on the cord

why can the cord be safely cut once the baby is born

leave the baby at birth by two minutes attached to the umbilical cord as well as reducing the risk of anemia during childhood as it makes the baby will get more iron, can also bring other benefits such as greater concentration of antioxidants and reduce the need for therapy oxygen at birth.

if a woman beginsto realease eggs at the age of 15 and stops releasing then at 45 hoe many eggs will she produced?

find out what special foods a mother to be should have in her diet and why?

It is a dietary mistake the old concept of a pregnant woman, having to feed two, to eat out too much. Actually, this is not the diet that included more food but that food which constitute the body provide the necessary amount of essential nutrients for good health of the mother and the healthy growth of the creature.

2009-06-15T10:58:00.000-07:00

¿Qué sucede con la presión si aplicamos calor? Para dar respuesta a esta pregunta, observemos lo que sucede en el experimento de la botella plástica. Cuando aplicamos calor a la botella, calor que viene desde nuestras manos, observamos que la moneda sobre la boca de la botella, de un momento a otro, salta. Este fenómeno nos sugiere que, al aplicar calor al gas, este aumentó su presión, de modo que en la boca de la botella se produjo una diferencia de presión (valores diferentes de la presión entre dos puntos del espacio), que se traduce en una fuerza neta hacia arriba que hace saltar la moneda.

2009-06-15T10:57:00.001-07:00

1. Con el clavo y el martillo realizamos un agujero en la tapa del bote de cristal. Cuidado con el martillo.
2. Metemos la cañita tal como vemos en la imagen.
3. Llenamos de agua el tarro (unos dos cm) y colocamos la tapa. Es importante que no entre aire en el tarro. Ponemos pegamento en la unión de la cañita con el agujero de la tapa y, si es necesario, podemos sellar la tapa del bote con cinta aislante.
4. Rodeamos el bote con nuestras manos.

Vemos que sube agua por la cañita.

Explicación:

La temperatura de nuestro cuerpo es superior a la temperatura del frasco de cristal.
Al rodear el bote con nuestras manos, suministramos energía al frasco de cristal y aumenta la temperatura del aire en el interior del frasco. Dicho aumento de temperatura produce un aumento de la presión en el interior del frasco que empuja el líquido que sube por la cañita.
Si abrimos la tapadera del frasco, la presión en el interior recupera su valor original y el líquido que sube por la cañita cae al frasco.

2009-06-15T10:55:00.000-07:00

HEAT AMD TEMPERATURE

2009-06-04T15:10:00.000-07:00

HEAT: is energy in transit it is transmited between bodies wich are at different temperatures and wich come into contact with each other.

TEMPERATURE: is a physical magnitude related to the amount of heat that a boby can receive and absorb. it is a type of energy wich is not, it only appears the transfer of energy.

HEAT TRANSMISSION IN BODIES

CONDUCTION: is the transmission of heat through an solid object example: a piece of metal in the fire.

CONVECTION: transfer heat through an interchange of cold and hot molecules example heating water in a tea pot.

RADIATION: is the transfer of heat by electromagnetic radiation, gerenally with infrared exampleis the way a room is warmed.

HOMEWORK

investigate

thermometer scals

perceptionof heat the skin, the sense of touch

burns

hot bodies

cold bodies

solution

low heat 0 34' c

normal 36'c 37'c

high heat 38'c

thermometer : instrument used to measure the temperature. the most used thermometer is the made up of mercury formed by a capillaryof glass of a uniformdiameter comunicater by an end with a blader full with mercury.

TYPES OF THERMOMETER

* made of glass and using mercury

* made of glassand using niquel, oxid, coblat and magnesium

* for high temperatures made of metal using electronic circuits.

2009-05-13T17:10:00.001-07:00

LIGHT
NO one can see anything in a completely darkned room. There has to be light before you can see. You see when light enters your eye. And so you have to know something about light to understand how the eye Works.
WHAT IS LIGHT?
Light is a kind of energy. It’ s a type of radiation. Light energy is given off by a sun, by electric light, bulbs, by candles, and other light sources. Light energy travels from one place to another.
The light travels in atraight lines. (You can see that from the picture of the sun). It’ s often useful to think of the light travelling as light rays. The rays are like tiny beans of light, travelling through the air at 300.000 km each second.
SHADOWS AND REFLEXIONS
Because light tralvels in straigh lines, shadows form.
WHAT IS SHADOW?
Is an area behind on object where no light from a light source reacines.
When the sun shines on an object like a tree, the sun’ s cannot bend round cornrs to reach the area behind it. That’ s why the area behind the tree is dark, and that’ s what makes. The shadows light rays can be bounced off, or reflected off an object you see thid board because rays of light are being reflected from it into your eye. Shiny, surfaces, like a mirrors reflects light best you can see how a mirror reflects the rays.

LIGHT AND SOUND

2009-05-04T18:04:00.000-07:00

The light comes from the sun. it is quite high up in the sky because the shadows are long ( vertical plane).
other sources of light are: the lamps, candies, torches, screen,and so on.
natural sources of light:the sun amd the moon.the shape and the size of the shadow depends on the shape of the object that is causing the shadow and its orientation with respectto the source of light.
SOUND: Intense sounds can be heard from a greater distance from the place of origin than weaker sounds. for example: the sound made by a computer can heard when we are working on the computer but not if we are 40 or 50 meters away the pitch is defferent also much more intense sounds are made on a drum than on a guitar.

red car goes black

2009-05-04T07:57:00.001-07:00

You will need:- 1 Strong Torch and rubber band.- Green Cellophane- 1 Red object e.g. car, tomato, hat- A very dark room Instructions1. Place the green cellophane over the torch and secure with a rubber band.2. Darken the room and shine the green light on the red object4. What colour do you see? Try different coloured objects and lights. Is the effect always the same?

letter 2070

2009-03-29T11:23:00.000-07:00

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?

2009-03-29T10:22:00.001-07:00

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.

ALTERNATIVE SOURCES OF ENERGY

2009-03-16T16:47:00.000-07:00

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.

ENERGY SOURCES

2009-03-15T07:47:00.000-07:00

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.

energia nuclear

2009-03-13T05:43:00.001-07:00

types of energy

2009-03-10T14:42:00.000-07:00

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.

NUCLEAR ENERGY

2009-02-22T08:36:00.000-08:00

It's called nuclear energy to that which is obtained by exploiting the nuclear reactions caused by spontaneous or man. These reactions occur in certain isotopes of some chemical elements, the most famous of this type of energy fission of uranium-235 (235 U), with operating nuclear reactors. However, to produce this type of drawing energy nuclear reactions can be used many other isotopes of various chemical elements such as thorium, plutonium, strontium, or polonium.

2009-02-16T14:28:00.000-08:00

tropism is a response produced by a plant by the action of hormones, compared to an external stimulus. The plants have no sense organs. Nor can move to change the environment that surrounds them. However, as animals, plants can detect changes in the environment and respond to them. The most frequent response in plants is to grow slowly in one direction defined by the stimulus. These may include: Positive when the plant grows toward the stimulus

Phototropic reaction is the ability or by hormones, a plant to change the direction of its normal growth occurs when the light changes, as in growth, the light is very important and also in carrying out photosynthesis, rioja which leads us to conclude that in response to this stimulus, the plant grows toward the light source. This change occurs because some plants have specialized receptors, called fototropinas that activate the plant hormone auxin.

Geotropismo or gravitropismo is one response to a stimulus on the gravitational force of the bodies. Ie, the stems always grow up to find the necessary light for photosynthesis, the roots into the soil, there you will find water and minerals.

Hidrotropismo corresponds to a movement to plant wetlands, where the water. Given this root stimulation a clear positive response, thus spoke of a positive hidrotropismo.

Nastia is a transient response in certain areas of a plant compared to an external stimulus and diffuse, based on processes of growth or change in the turgidity of groups of cells that vary in volume by controlling the entry and exit water, the resulting movement is not influenced by the direction of the stimulus.