Suppose it is January and the Sun remains above your horizon all day long. Where must you be located?
A) at the South Pole
B) at the North Pole
C) somewhere between the Antarctic Circle and the South Pole
D) somewhere between the Arctic Circle and the North Pole
C
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In which stage of a star's evolutionary cycle does it spend the most time?
A. the post-main sequence B. the pre-main sequence C. the main sequence D. It depends on the mass of the star.
At what rate is thermal energy generated in the 30-? resistor?
a.
20 W
b.
27 W
c.
60 W
d.
13 W
e.
30 W
A spacecraft (mass = m1) orbits a planet (mass = m2) in a circular orbit (radius = r). What is the minimum energy required to send this spacecraft to a distant point in space where the gravitational force on the spacecraft by the planet is negligible?
a. Gm1m2/(4r) b. Gm1m2/R c. Gm1m2/(2R) d. Gm1m2/(3R) e. 2Gm1m2/(5R)
Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom?
A) A B) B C) C D) D