Why do Venus and Earth have the youngest surfaces?
A. Mercury and Mars formed earlier than Earth and Venus.
B. Both Venus and Earth have active interiors that recycle the planets' crusts.
C. Both have liquid water that erode the planets' surfaces.
D. Venus and Earth have been bombarded by impactors that have renewed their surfaces.
Answer: B
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The Egyptian constellation found where modern Orion is located
Two artificial satellites are in circular orbits about the Earth. Which of the two will be moving more slowly along its orbit?
A. The lower one B. The one with the smaller mass C. The higher one D. The one with the larger mass
The appearance of an aurora indicates that
A. the planet is being bombarded by small meteors. B. there is intelligent life on the planet producing the aurora from below. C. there is a lot of lightning discharges in the planet's atmosphere. D. the planet has a magnetic field.
The distance between the object and the eyepiece of a compound microscope is 25.0 cm
The focal length of its objective lens is 0.200 cm and the eyepiece has a focal length of 2.60 cm. A person with a near point of 25.0 cm and a far point at infinity is using the microscope. (a) What is the angular magnification obtainable using the eyepiece alone as a magnifying lens if the final image is at the person's far point? (b) What is the total magnification of the microscope when used by the person of normal eyesight?