Consider the cosine of any angle between 35° and 40°. If the angle were doubled, what would happen to the cosine of the angle
a. It would halve.
b. It would decrease to less than half its original value.
c. It would decrease but be more than half its original value.
d. In different cases, it could do any of the above.
b
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Mars' axial tilt and spin are most similar to ________.
A. Venus's B. Mercury's C. the Moon's D. Earth's
If a twin goes on a trip in a high-speed rocket ship, when she returns home she will be younger than her twin sister who did not go on the trip because of the special relativistic effect of __________
Fill in the blank(s) with correct word
How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring the masses and spectral types of main-sequence stars in binary systems B) by using computer models of hydrogen fusion and stellar structure C) by measuring stellar radii with powerful telescopes D) by comparing stars with the same spectral type but different luminosities
The main form of radiation that our bodies emit is __________
Fill in the blank(s) with correct word