Why do scientists think Titan has an atmosphere while the large moons of Jupiter (Ganymede, Callisto, Europa and Io) do not?
A) The jovian satellites lost their atmospheres because of Jupiter's thermal radiation.
B) The jovian satellites never formed atmospheres because the solar nebula was too hot there.
C) The jovian satellites had their atmospheres stripped by Jupiter's gravitational pull.
D) The jovian satellites experienced too many collisions in their lifetimes to maintain atmospheres.
E) Titan got its atmosphere by accreting gases from Saturn. The jovian satellites were competing with one another to do this, so it was unsuccessful for any of them.
B
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After the hydrogen in the star's core is depleted, the core
A. shrinks and heats up. B. shrinks and cools down. C. expands and heats up. D. expands and cools down.
The ratio of a mineral sample's weight to the weight of an equal volume of water is called the mineral's ______________
Fill in the blank(s) with correct word
The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that
a. they are formed by material falling into the galaxy. b. they are powered by magnetic fields. c. they are excited by radiation from nearby galaxies. d. they are powered by the rapid rotation of the galaxy. e. they are created by jets from the galaxy emitting where the material is halted.
A man pulls a sled at a constant velocity across a horizontal snow surface. If a force of 85 N is being applied to the sled rope at an angle of 56° to the ground, what is the force of friction between sled and snow?
a. 85 N b. 70 N c. 48 N d. 5 N e. 43 N