Questão 4635

UFPB
  1. Física
  2. Física

(Ufpb 2007) Em um experimento de óptica, em sala de aula, uma régua de 30,0 cm de comprimento, quando colocada perpendicular ao eixo principal e a 24,0 cm do vértice de um espelho esférico côncavo, produz uma imagem invertida de 10,0 cm de altura. Nessas circunstâncias, a distância focal do espelho, em cm, é:

A

2

B

3

C

4

D

5

E

6

Gabarito:

6



Resolução:

Primeiro vamos ver qual distância do vértice está a imagem formada:

frac{i}{h}= - frac{p}{p}Rightarrow frac{-10}{30}=- frac{p}{24}Rightarrow p=8cm

Agora jogamos na formula de Gauss:

frac{1}{f}=frac{1}{p}+frac{1}{p}Rightarrow frac{1}{f}=frac{1}{24}+frac{1}{8}Rightarrow frac{1}{f}=frac{1+3}{24}Rightarrow frac{1}{f}=frac{1}{6} Rightarrow f=6cm



Questão 3147

UFPB
  1. Inglês
  2. Inglês

(UFPB -1998)

TEXTO PARA A PRÓXIMA QUESTÃO:

            International advertising can be a risky business. When McDonald's Iaunched Le Big Mac in Paris, it discovered that in local slang this meant "the big pimp". It is not just a question of language either; national advertising styles also vary considerably. The British like humor and irony in their ads, whereas the Germans regard this approach as frivolous. The French are more sexist than the British and will use semi naked women in almost any context. The Italians generally like to see beautiful people wearing beautiful clothes driving beautiful cars. These are not just national stereotypes, but based on hard experience. Different countries also prefer different products.

 

The text is PREDOMINANTLY in the _________

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Questão 3219

UFPB
  1. Inglês
  2. Inglês

(UFPB - 1998)

Read this sentence:


"_________ good idea is _________ good idea, whether it's done in ________ one, ________ three or 33 countries."

It is completed by the following sequence:

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Questão 3450

UFPB
  1. Inglês
  2. Inglês

(Ufpb 2006)

FROM: Suzana Ramos
TO: Angela Smith
SUBJECT: Telecenters
DATE: November 10, 2005

Dear teacher,
How are you? Do you remember me? I took computer lessons with you at SESC last year. Now, I have a dream. im interesting in creating a Telecenter in my community for the local youth so that we could somehow cut down the digital divide that pervades our society.
I live in a very poor suburb in João Pessoa, Paraíba. There are many teenagers who urgently need training and professional guidance, and mainly hope.
What should I do to make this dream come true? I remember you once told me something about agencies that developed digital inclusion projects in disadvantaged areas. 1How could I get in contact with those agencies? What kind of support do they provide?
Any information would be of great help. Thank you very much for your support. I look foward to hearing from you soon.

Yours,
Suzana Ramos.

According to the text, Suzana intends: 

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Questão 3681

UFPB
  1. Física
  2. Física

(Ufpb 2007) Considere os vetores A, B e F, nos diagramas numerados de I a IV.

Os diagramas que, corretamente, representam a relação vetorial F = A - B são apenas:

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