If in the absence of external forces, a rotating ball of hot gas cools and contracts, its rate of rotation
1) decreases
2) remains essentially the same
3) increases
and its angular momentum
4) decreases.
5) remains essentially the same.
6) increases.
Answer: 3, 5
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As of early 2013, the number of confirmed exoplanets found was:
A) 5, all around stars within 20 light years of us. B) 42, all much bigger than Jupiter, but orbiting red dwarf stars. C) over 400, orbiting more than 300 stars. D) about 900, mainly around stars much smaller and fainter than our Sun. E) thousands, around every star we have closely examined to date.
Air temperature can increase by the process of
A) moisture condensation. B) contact with cold surfaces. C) moisture evaporation. D) all of the above
In general, the ________ lunar craters sit atop the mare
Fill in the blank(s) with correct word
The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (?0 = 4? × 10-7 T ? m/A)
A) 0.40 A B) 0.80 A C) 1.6 A D) 3.2 A E) 0.20 A