Notes, abstracts, papers, exams and problems of Physics

The cell cycle: sequence of cellular growth and division.
5 phases=
1.First growth(the cell grows.)
2. Synthesis(dna is copied)
3. Second growth(prepares the nucleus to divide)
4. Mitosis(the nucleus divides)
5. Cytokinesis(cytoplasm divides)
CONTROL of the cell cycle during the checkpoints.
1.first growth checkpoint
2. second growth checkpoint
3. mitosis checkpoint
WHEN CONTROL IS LOST=CANCER.


MITOSIS= the chromatids on each chromosomes phsisically moved to opposite poles of the dividing cell helped by the SPINDLE(cell structure made of centrioles and proteins[microtubes}.
PROPHASE=THE NUCLEUS DISOLVES
METAPHASE=chromosomes aling in the equator of the cell.
ANAPHASE=chromatids move toward opposite poles.
Telophase=nuclear envelope forms, cytokinesis occurs.
MEIOSIS= formation of haploid cells. Gametes are haploid cuz they have 1 set of chromosomes.
... (Continue)

studies are studied, came were come, will study will be studied, should study should be studied, is studying are being studied, was studying were being studied, has studied have been studied, had studied had been studied ,must have studied must have been studied, has to study have to be studied,  is going to study are going to be studied. ask either begoña or nerea. you can neither drink nor eat.  both my brother and I. prefijos( un, im, in, dis,,, under, re, inter, over, anti, bi, pre, multi) sufijos ( verbos dan adjetivo ed, ing,,, nombres ful, less,,, ous, al, able, ive)

PABLO MEDIA LISTADO INT INT

void estadisticas (void) {

int opc=1, a[N], *p,cont,r; float m; p=a;

while (opc!=2) {

clrscr();

printf("MENU:\n\n");

printf("1. Listado precio superior al medio\n");

printf("2. volver.\n");

printf("Opcion: ");

fflush(stdin);

scanf("%i",&opc);

switch(opc) {

case 1: r=listado(p); break;

default: break; } }

clrscr(); }

int cargarn(int *p) {

int s=0;

exotic=fopen("exotic.dat","r");

 fread(&regmaestro,sizeof(regmaestro),1,exotic);

 while(!feof(exotic)) {

cont++; s=s+regmaestro.precio;

*p=regmaestro.precio; p++;

fread(&regmaestro,sizeof(regmaestro),1,exotic); }

fclose(exotic);

return s; }

int listado (int *p) {

int r, s; s=cargarn(p); r=s/cont;

... (Continue)

Sailing to Byzantium Yeats 1928

I interpret the poem as a trip from the beginning of the life up to the end of the life.

In the first stanza Yeats speaks about his ground of birth: "That is no country for old men." He speaks about the nature and he says that quite what is born, it dies.  In the second stanza, I think that he ponders on board of the ship. In the third stanza, Yeats looks amazed at the mosaic of the wise people, which they teach to the soul of the people. Also Yeats in this stanza does a request to the wise people; he says to them that they should take it with them towards the immortality.

 In the fourth stanza, Yeats speaks about a trip after the death, coming this way to the immortality. He says that the nature is a life, it is the change and the death is the eternity.

1. Light

What is it?

· Is a form of electromagnetic energy. Very small particles called photons move in a wave pattern.

· Visible light is the light which allows you to see the colors and shapes of objects.

· The sources of energy can be natural or artificial.

... (Continue)

1.Escrever as definições correspondentes às classes TPessoa e TAluno contendo somente a especificação básica das classes citadas . Obs: TPessoa é uma classe abstrata.

R:

namespace ListaEx01a03
{
public class TEnd
{
// Atributos da classe
private string Logradouro;
private string Cidade;
private string CEP;

//Construtor sem parametros
public TEnd()
{
Logradouro = "";
Cidade = "";
CEP = "";
}

//Constutor com parametros
public TEnd(string Logradouro, string Cidade, string CEP)
{
this.Logradouro = Logradouro;
this.Cidade = Cidade;
this.CEP = CEP;
}

 

“The Income Statement shows the income for the year, made of its revenues and expenses,except when they must be recognized directly in equity”= NET TURNOVER= Ventas netas - Rappels sobre ventas (709)- Devoluciones de ventas y op. similares (708 ) - Descuento sobre ventas por pronto pago (706) = Venta de mercaderías / productos terminados /pdtos. Semiterminados/ subproductos y residuos /envases y embalajes (700/1/2/3/4)- Descuentos comerciales Importe de la venta . +Services rendered(705)= Services rendered .Procurements (Aprovisionamientos)a) Consumption of goods for sale
b) Consumption of raw materials and other consumables c) Work performed by other companies d) Impairment of goods for sale, raw materials and other consumables . Consumption of goods for sale Initial inventory + ... (Continue)

vascular system: that is made up of long tublike cells. transpiration: movement of water out of a plant and into the air. seed: young plant that is enclosed in a protective coating. embryo: immature form of an organism that has the potential to grow and develop. germination: beginning of growth of a new plant from a spore or a seed. pollen: small multicellular structure that holds a sperm cell. gymnosperm: plant that produces seeds that are not enclosed to flowers or fruit.  angiosperm: seed plant that produces flowers and fuits. flower: reproductive structure of an angiosperm. fruit: ... (Continue)

Sistema Isolado

Qf = Qi      deltaQ = 0

1. Astronauta no espaço longe da atração gravitacional de qualquer astro, sem a presença de atmosfera, lançando um objeto.
2. Dois patinadores se empurrando numa pista sem atrito.
3. O disparo de uma arma de fogo.
4. Explosão de uma bomba
5. Uma pessoa andando sobre um pequeno barco
6. Duas caixas comprimindo uma mola e depois liberando-a
7. Coque de dois móveis (choque de movel contra obstaculo fixo não é sist. isolado)

Lentes

objeto real = p+

objeto virtual = p-

imagem real = p+

imagem virtual= p-

convergente: f>0

divergente> f<0

1. Sinais do objeto quando não há informaçoes = p+ e y+
2. Toda imagem projetada é real
3. Quando o objeto é real diante da lente:

• Se a imagem é real será invertida em relação ao objeto e ficará no lado oposto ao objeto, em relação a lente.

... (Continue)

F= (G m1.m2)/r²

G= GM/r²

Ep= -GMm/r

v= -GM/r

W= m(v1-v2)= Ep1-Ep2

g=go/(1+h/RT)²

V= ?GM/R

T= 2?R/v

v= wR

Em= -1/2GMm/R

Ve=?2GM/R

T1²/R1³= T2²/R2³= 4?²/GM

w=?K/m

T=2??m/k

Ep=1/2kx²

Pendulo: T=2??L/g      f=1/2??g/L

vp=?f= ?/T

K= 2?/?

Ec=1/2 mv²

Ep=1/2ky²

I=Ioe?x

?=Coef de absorcion

x=espesor del medio

I=P/S

I1/I2=R2²/R1²

A1/A2=R2/R1 esferico

A1/A2=?R2/R1 circular