(UFSCar-SP–2008) Considere um espelho plano e um observador, à sua frente, apoiados verticalmente sobre
o solo horizontal. A respeito do espelho e da imagem
daquele observador, conjugada pelo espelho, analise as
afirmações a seguir.

I. A imagem é virtual, tem as mesmas dimensões do
observador e é simétrica deste em relação ao espelho.
II. Se o observador se aproximar do espelho com
velocidade de 10 m/s, a sua imagem vai afastar-se
do espelho com velocidade de mesmo módulo.
III. O campo visual do espelho, para o observador,
independe da posição e da distância do seu olho em
relação ao espelho.
IV. Para o observador enxergar a imagem de todo o seu
corpo, as alturas do espelho e do observador devem
ser iguais.
V. Se o observador cair de costas, com a cabeça se
afastando do espelho, a sua imagem gira de 90° em
relação à imagem anterior.
O número de afirmações CoRRETAS e pertinentes é

A) 01.
B) 02.
C) 03.
D) 04.
E) 05.

Need asap ! what is the relationship between atmospheric pressure and the density of gas particles in an area of increasing pressure? (2 points) as air pressure in an area increases, the density of the gas particles in that area decreases. as air pressure in an area increases, the density of the gas particles in that area increases. as air pressure in an area increases, the density of the gas particles in that area remains constant. as air pressure in an area increases, the density of the gas particles in that area increases and decreases in an alternating pattern. 3. which of the following correctly describes a way in which earth's atmosphere interacts with the geosphere? (2 points) it contains gases that living organisms breathe. it contains gases that trap incoming solar radiation. it provides a medium for cycles that provide nutrients to living organisms. it provides a medium for water to move between earth's surface and the air. 4. which of the following is considered a drawback to using wind energy as a source of power? (2 points) wind energy is nonrenewable. wind energy produces large amounts of air pollution. 5. a meteorologist predicts that the weather in a region will soon change from clear skies to probable thunderstorms. prior to making this prediction, what did the meteorologist most likely observe on a barometer? (2 points) the barometer fell slightly. the barometer fell substantially. the barometer rose slightly. the barometer rose substantially. 6. which of the following do meteorologists not typically use weather balloons to record? (2 points) atmospheric pressure cloud types humidity temperature 7. during which step in the can crush lab did water vapor force air from the can? (2 points) the can was filled nearly to the top with water. the can was placed on the hot stove top burner for several minutes. the can was removed from the hot stove top burner. the can was placed upside-down in the water-filled pan.

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e