A rope is held from one end in such a way that the lower end just touches a table. The rope is then lowered onto the table with constant velocity. The force that is needed to hold the upper end of the rope is
A) equal to the weight of the portion of the rope that is not on the table.
B) greater than the weight of the portion of the rope that is not on the table.
C) less than the weight of the portion of the rope that is not on the table but not zero N.
D) zero N.
E) Cannot be determined without additional information.
A
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The number of sunspots and their activity peak about every:
A) 36 days. B) six months. C) year. D) eleven years. E) 76 years.
Briefly explain why spectral lines are useful in determining the temperature of their source
What will be an ideal response?
Most stars in our part of the Galaxy are formed
A) in a singular event just after the Big Bang. B) alone. C) in open clusters of a few dozen. D) in associations of thousands of stars across a spiral arm of the Galaxy. E) in globular clusters of millions of stars.
Analyze the NASA sunspot image shown. Based on that image, what is (or was) the best year to go travel to high latitudes to see the Northern Lights?
a. 2001
b. 2009
c. 2012
d. 2014
