An observer's nadir is:
A) the point directly opposite the observer's zenith.
B) the north point on the observer's horizon.
C) directly opposite the north celestial pole.
D) the south point on the observer's horizon.
A
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The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. Based on these data, the planet's orbital period is about
A) 2 days. B) 4 days. C) 6 days. D) 50 days.
A lunar eclipse can only happen when the moon is ________ (what moon phase).
Fill in the blank(s) with the appropriate word(s).
Air pressure is 1.00 × 10^5 N/m2, air density is 1.30 kg/m3, and the density of soft drinks is 1.00 × 10^3 kg/m3 . If one blows carefully across the top of a straw sticking up 0.10 m from the liquid in a soft drink can, it is possible to make the soft drink rise half way up the straw and stay there. How fast must the air be blown across the top of the straw?
a. 0.036 m/s b. 27 m/s c. 1.4 m/s d. 19 m/s e. 750 m/s
The unit of resistance is called a(n)
a. volt. b. ampere. c. coulomb. d. ohm. e. watt.