In the giant impact theory of the Moon's origin,
a. the Moon broke from a rapidly spinning Earth
b. the Earth and its Moon formed from the same cloud of matter
c. the Moon formed elsewhere in the solar nebula and was later captured by Earth.
d. the Moon formed when a very massive planetesimal smashed into the young Earth.
D
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If its density is less than the critical density, then a universe ________.
A. contains only antimatter B. expands forever C. never expands D. will re-collapse
If ? = 9.0 V, what is the current in the 15-? resistor?
a.
0.20 A
b.
0.30 A
c.
0.10 A
d.
0.26 A
An object is placed 100 cm in front of a diverging lens with a focal length of magnitude 25 cm. A converging lens having a focal length of magnitude 33.33 cm is placed 30 cm past the first lens. Where is the final image formed?
A) 3.0 meters before the second lens B) 100 cm after the second lens C) 30 cm after the second lens D) 20 cm in front of the first lens E) 3.0 cm before the second lens
What is the average kinetic energy of a nitrogen molecule in the air in a room in which the air temperature is 17.0°C?
A) 6.01 × 10-21 J B) 4.00 × 10-21 J C) 5.00 × 10-21 J D) 7.00 × 10-21 J E) 9.00 × 10-21 J