According to our present theory of solar system formation, which of the following statements about the growth of terrestrial and jovian planets is not true?
A) Both types of planet begun with planetesimals growing through the process of accretion, but only the jovian planets were able to capture hydrogen and helium gas from the solar nebula.
B) Swirling disks of gas, like the solar nebula in miniature, formed around the growing jovian planets but not around the growing terrestrial planets.
C) The jovian planets began from planetesimals made only of ice, while the terrestrial planets began from planetesimals made only of rock and metal.
D) The terrestrial planets formed inside the frost line of the solar nebula and the jovian planets formed beyond it.
C
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Evidence from the analysis of zircon crystals suggests that the Earth
A) may have been habitable immediately after its formation B) could only have been habitable after significant amounts of oxygen had built up in its atmosphere C) could only have been habitable after the end of the Hadean Eon 500 million years ago D) may have been habitable in as little as 100 million years after its formation
Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2 . Which of the following relative values for radii and lengths would result in equal resistances?
a. r1 = r2 and 4L1 = L2 c. 2r1 = r2 and 4L1 = L2 b. r1 = r2 and L1 = 2L2 d. 2r1 = r2 and L1 = 2L2
The acceleration due to gravity near the surface of Mars is about one-third of the value near the Earth's surface. If a rock fell from rest for the same amount of time on Mars and Earth, the final speed of the rock would be
A. three times faster than on Earth. B. the square root of three times slower than on Earth. C. the square root of three times faster than on Earth. D. three times slower than on Earth. E. the same speed as on Earth.
A concave mirror has a 12 cm tall object placed 40 cm in front of it. An image forms 60 cm in front of the mirror. What is the size and orientation of the image?
A. 8.0 cm, inverted B. 8.0 cm, upright C. 18 cm, inverted D. 18 cm, upright E. 24 cm, upright