Which is the lightest particle?
A) proton
B) electron
C) neutron
D) all about the same
Answer: B
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How does the diameter of the disk of the Milky Way Galaxy compare to its thickness?
A) The diameter is about 100 times as great as the thickness. B) The diameter and thickness are roughly equal. C) The diameter is about 10 times as great as the thickness. D) The diameter is about 100,000 times as great as the thickness.
The reason that most extrasolar planets discovered by the Doppler technique are found close to their parent stars is
A) the closer to a star, the hotter and therefore brighter the planet is. B) more of the starlight is blocked by the planet when it transits the star. C) planets that are close to a star are heated up and therefore larger. D) they transit more frequently, and have thus been more likely to be detected in the short time we have been searching for them. E) the wavelength shift of the star's spectrum is larger.
The Earth lies close to the center of the Galaxy
Indicate whether the statement is true or false
A rod (length = 2.0 m) is uniformly charged and has a total charge of 40 nC. What is the magnitude of the electric field at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
a. 40 N/C b. 45 N/C c. 24 N/C d. 90 N/C e. 36 N/C