How do the size and mass of Jupiter's core compare to the size and mass of Earth?
A) It is the same size and mass.
B) It is about 10 times larger in size and the same mass.
C) It is about the same size but is 10 times more massive.
D) It is about 10 times larger both in size and mass.
E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
C
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A 1.37-kg block is held in place against the spring by a 74-N horizontal external force (see the figure)
The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring. The block descends a ramp and has a velocity at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.24. The velocity of the block is at C. The block moves on to D, where it stops. The initial compression of the spring is closest to A) 2.7 cm. B) 1.4 cm. C) 0.96 cm. D) 5.3 cm. E) 3.6 cm.
The idea of dark matter arose to explain gravitational effects observed in galaxies and clusters of galaxies
However, studies of the early universe (especially of the cosmic microwave background and of chemical abundances) also tell us something about dark matter. What do they tell us? A) They add further support to the idea that dark matter really exists and is made of non-ordinary (nonbaryonic) matter, such as WIMPs. B) They do not support the conclusion that dark matter is the dominant form of matter in the universe. C) They tell us that dark matter probably exists, but that it must be made of ordinary (baryonic) matter in the form of MACHOs. D) They tell us that dark matter was produced during the era of nuclei.
Why are sedimentary rocks and the processes that produce them more accessible than igneous and metamorphic rocks?
On page 526 of your textbook, you learned that one gram of radium produces over a million times the radiation as does one gram of uranium. This means that a much larger fraction of radium atoms are undergoing radioactive decay each second than for uranium. How does the half-life of radium compare to the half-life of uranium?
a. The half-life of radium is much smaller than the half-life of uranium. b. The half-life of radium is the same as the half-life of uranium. c. The half-life of radium is much larger than the half-life of uranium. d. The information is insufficient to answer the question. e. The half-life of the radium is shorter at first, but gets longer as the radium sample is depleted.