Where does most star formation occur in the Milky Way Galaxy?
A) in the spiral arms B) in the central bulge
C) everywhere throughout the galactic disk D) within the halo
A
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The mass of an oxygen molecule is 16 times that of a hydrogen molecule. At room temperature, the ratio of the rms speed of an oxygen molecule to that of a hydrogen molecule is:
A. 16 B. 4 C. 1 D. 1/4 E. 1/16
The force that acts between a pair of magnetic poles depends on
A) magnetic pole strength. B) separation distance. C) both of these D) neither of these
A horizontal wire of length 4.5 m carries a current of 5.8 A and is oriented so that the current direction is 53° S of W. The Earth's magnetic field is due north at this point and has a strength of 0.14 × 10^?4 T. What is the size of the force on the wire?
a. 2.9E–4 N b. 3.4E–4 N c. 1.4E–4 N d. 2.2E–4 N e. 7.8E–5 N
When an unstable Nickel nucleus undergoes gamma decay, the nucleus formed is that of
a. Nickel. b. Zinc. c. Cobalt. d. Iron. e. Copper.