Why does the atmosphere of Saturn appear to have only half the helium content of Jupiter?
A) Because Saturn is so much colder, helium does not show up as strongly in its spectrum.
B) Saturn was formed farther from the helium rich Sun.
C) A red dwarf, Jupiter has fused some of its hydrogen into helium, whereas Saturn, a colder planet, has not.
D) Much of Saturn's helium has differentiated towards its center.
E) Much of Saturn's helium has reacted with water and formed helium oxide.
D
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A capacitor of capacitance C = 6 ?F is connected in series with a resistor R = 5 M? to a battery of emf E = 15 V. What is the value of the current in the circuit when the capacitor has reached 20% of its maximum charge?
A) 6.5 ?A B) 2.4 ?A C) 1.3 ?A D) 4.7 ?A E) 9.1 ?A
A lens that is thicker at the center than the edges
a. is a converging lens b. is a diverging lens c. always forms a real image d. always forms a virtual image e. none of the above
In any sequence of sedimentary rock layers that have not been subjected to stress, you would expect to find
A) horizontal layers. B) older layers at the bottom and younger layers at the top. C) fossils in the bottom layers and inclusions in the upper layers. D) older horizontal layers at the bottom with younger horizontal layers at the top.
Neptune was discovered due to irregularities in Uranus' orbit. At closest approach, these two planets are about 10 AU apart
a) What is the force of gravity between these two objects? b) How does that compare to the force of gravity between the Sun and Uranus (approximately 20 AU from the Sun)?