If an object moves with constant acceleration, its velocity must
A) be constant also.
B) change by the same amount each second.
C) change by varying amounts depending on its speed.
D) always decrease.
Answer: B
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The portion of the electromagnetic spectrum between the 21 cm line of neutral hydrogen and the 18 cm line of OH is known as the ____________________
Fill in the blank(s) with correct word
Which of the following is not an observed characteristic of the cosmic microwave background?
A) It contains prominent spectral lines of hydrogen, the primary chemical ingredient of the universe. B) It has a perfect thermal radiation spectrum. C) Its temperature is a little less than 3 Kelvin (3 degrees above absolute zero). D) Its temperature is the same everywhere, except for small variations at the level of 1 part in 100,000.
Why does the Moon play a larger role in tides than the Sun?
What will be an ideal response?
Earth's magnetic field is
A) something we've learned to live with. B) useful to pigeons but not to humans. C) protective to life on Earth.