Why is most matter electrically neutral?
a. It contains no charges.
b. There are equal amounts of positive and negative charges present.
c. The charge on the electrons and protons in the material is too small to notice.
d. none of the above
b
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Radio telescopes are generally ________ than visible-light telescopes.
A) much larger B) much smaller C) much more expensive D) located at much higher altitudes
If an object is located 20 m to the left of the origin at 1:00 PM, and later the object is located 30 m to the right of the origin at 2:00 PM, then the displacement from 1:00 PM to 2:00 PM is
A. 50 m to the right. B. 30 m to the right. C. 25 m to the right. D. 20 m to the left. E. 10 m to the left.
Which moon of the Jovian planets has a thick, hazy atmosphere?
a. Io b. Triton c. Europa d. Titan
Why is Supernova 1987A particularly important to astronomers?
A) It occurred only a few dozen light-years from Earth. B) It provided the first evidence that neutron stars exist. C) It was the first supernova detected in nearly 400 years. D) It provided the first observational evidence that supernovae actually occur. E) It was the nearest supernova detected in nearly 400 years.