Six months of daylight at the North Pole begins when the Sun is at the
a. winter solstice.
b. summer solstice.
c. autumnal equinox.
d. vernal equinox.
d
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Which of the following places is not generally considered a potential home for life in our solar system?
A) Mars B) Jupiter's atmosphere C) Europa D) Titan
A proton is circling the Earth above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4.00 × 10^–8 T. If the proton is moving at a speed of 2.7 × 10^7 m/s, how far above the surface of the Earth is the proton? Earth's radius is 6.38 × 10^6 m, a proton's mass is 1.67 × 10^–27 kg, and its charge is 1.6 × 10^–19 C
a. 7.05E+6 m b. 1.34E+7 m c. 1.03E+8 m d. 6.65E+5 m
The three blocks in the figure are on a frictionless surface. If F = 48.0 N, m1 = 2.0 kg, m2 = 1.5 kg, and m3 = 3.5 kg, what is the tension in the cord?
a.
24.0 N
b.
6.86 N
c.
13.7 N
d.
32.0 N
Two things that are quantized in the Bohr model of the hydrogen atom are __________ and __________
Fill in the blank(s) with correct word