Um objeto real é colocado a uma distância “p” de um espelho esférico côncavo que apresenta raio de curvatura igual a 20 cm. Observa-se que este espelho conjuga uma imagem real e 4 vezes maior que o objeto. Com base nestas informações, podese afirmar que a imagem é e a distância p vale cm.

Dentre as alternativas a seguir, assinale aquela que preenche corretamente as lacunas da questão.

Ao simplificar a expressão (1 + cos x)(1 – cos x), tem-se

Seja a equação x³ – 5x² + 7x – 3 = 0. Usando as relações de Girard, pode-se encontrar como soma das raízes o valor

Na figura, ABCD é um quadrado formado por pequenos quadrados de lado x divididos por uma de suas diagonais. Assim, a área sombreada, em função de x é

A função f(x) = x² – 2x – 2 tem um valor , que é .

Understanding the Five Elements

Water is represented by the color black and the calm stillness of winter. People dominant element is water prefer salty foods. They tend to be peaceful and introspective, though they can also be stubborn individuals. Water people value privacy and rarely share their personal thoughts with others.

Wood is represented by the color green and the rebirth of spring. People dominant element is wood prefer sour foods. They tend to be driven, assertive individuals, which can sometimes make them argumentative and difficult to get along with. However, they can also be understanding, helpful individuals who are happy to assist others in need.

Fire corresponds to the color red and the season of summer. People dominant element prefer bitter foods. They tend to be optimistic, energetic, unpredictable individuals. Fire people often have strong opinions, and are risk takers: they are passionate people who love excitement and change. Like fire, though, they can also be destructive and rude.

Earth is represented by the color yellow and is related to late summer – a time of wellbeing when things are in balance. People dominant element is earth prefer sweet foods. Earth people are slow to change their minds and rarely lose their tempers. They tend to be patient, easygoing, caring, and nurturing, although like some parents, they can also be overprotective.

Metal is represented by the color white and is related to the season of autumn. People dominant element is metal prefer spicy foods. They tend to be systematic and refined, but are sometimes viewed by others as somewhat distant or unfriendly.

GLOSSARY
nurturing – supportive
somewhat – more than a little but not very

Put the following adverbs: sometimes, often and rarely in order, from the least frequent to the most frequent.

O gráfico a seguir relaciona a variação de temperatura (T) para um mesmo calor absorvido (Q) por dois líquidos A e B diferentes.

Considerando:
-massa de A = mA;
-massa de B = mB;
-calor específico de A = cA;
-calor específico de B = cB.

Pode-se dizer que !$ { \large m_A c_A \over m_B c_B} !$ é igual a

Uma emissora de rádio AM, emite ondas eletromagnéticas na frequência de 800 kHz. Essas ondas possuem um período de !$ μs !$.