Which of the following represents the shortest distance?
a. One parsec
b. One astronomical unit
c. One light-year
d. One right ascension
b
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A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30, and the coefficient of kinetic friction is 0.20
What horizontal force must be applied to the box to cause it to start sliding along the surface?
Which of the following is the best answer to the question, "Why does the Sun shine?"
A) The Sun initially began making energy through chemical reactions. These heated the interior enough to allow gravitational contraction and nuclear fusion to occur. B) The Sun initially began generating energy through nuclear fusion as it formed, but today it generates energy primarily through the sunspot cycle. C) As the Sun was forming, nuclear fusion reactions in the shrinking clouds of gas slowly became stronger and stronger, until the Sun reached its current luminosity. D) As the Sun was forming, gravitational contraction increased the Sun's temperature until the core became hot enough for nuclear fusion, which ever since has generated the heat that makes the Sun shine.
Imagine a small magnet with its north pole vertically upward passing near the south pole of an external magnet that is above the small magnet. In what direction does the net force acting on the magnet point?
A. Upward. B. Downward. C. There is zero net force. D. None of the above (explain).
The Hawaiian Islands are predominantly made up of
A) intrusive igneous rock. B) volcanic igneous rock. C) sedimentary rock. D) metamorphic rock.