14/09/09

Moving charges

You can do some hair racing experiments with van de graaff generator.this is a machine for building up and storing electric charges when it is switched on,negative charges collect on the dome.the dome becomes negative charges .

Storing charge:if you stand on a prece of plastic and touch the dome,you body connects extra negative charge from the dome.thats when your hair stands on end.each hair becames negatively charge the hairs repel each other .

Losing charge:if you then touch a water tap,your body loses this charges you hair goes bag to normal .the charges flow for body a long the water pipe to the earth you can feel them go your fingers tingle.

Flow a charges: there are two good ways of chowing this flow of charge you can connect a neon bulb between the generation and the water tap.the bulb glose as the charges flow through it you can also connect in a meter wich measure small electric currents the flow of charge through the meter makes the meter middle move.

Atoms contain negatively charged particles: electrons

Positively charged particles: protons

07/09/09

Electricity

Is a kind of energy .it has two different kinds of: positive charge and negative charge.

+ And+=repel

-And - =repel

+ And - =attract

Before rubbing, the pen has equal numbers of positive and negative charge. This charges balance each other. The pen is electrically neutral.

When the pen is rubbed with other thing, negative charges travel from the other from the other thing to the pen. The pen now has more negative charges have left the other thing; it now has more positive charges than negative .it has become positively charged.

Atoms contain negatively charged particles =electrons

Positively charged particles=protons

Neutral particles = neutrons

Genes

Whether you are natullary tall or small , blond or brown haired ,blue or green eyed , left or right handed ;depends largely on the genes in your body cells :

A gene is a part of one of the choromose threads inside the ncleus of each cell, those control the characteristics which are passed on from parents to their children when an egg is fertilized two sets of genes are put together one set cames from the father in the sperms chromosomes and the other set from the mother in the egg´s chromosomes ach set carries half of the tajal instruccions for the new human those gones passed carry instruccions for the nero human those genes passed carry instruccion about body characteristics like height hair color and eye color.

dominant genes: the genes with “stronger” of dominat instructions will control what happens.

Heredity: is the passing on of characteristics from one generation to the next.

Chromosomes: Are fine theads of material for carry instructons. There are 10.000 genes on each chromosomes.

Human cells have 46 choromosomes . sperm and eggs have only half that number when a sperm and egg join up a new being begins to grow.

First stage: each choromosome makes an exact copy of Itself.

Nombre: Frank Carrillo Ramirez

Grado :octavo

Fecha: 03/09/09

1.Nombra dies herramientas en photshop

Rta:Recortar,pegar,copiar,destruir,zoom,arrastrar,borrar,laso magnitico,estilo,duplicarse.

2.Por que utilizar photshop y no paint

Rta: por que photshop es mas actualisado tiene mas funciones y paint es desactualisado , tiene pocas funciones,photoshop edita mejor las fotos , tiene programas de actualisacion.

3.Cual es la empresa de photshop:

Rta:Adobe flash player

4.Diagrama como se saca una nueva pagina: