If part of the full Moon passes through Earth's umbra, we will see a(n)
A) total lunar eclipse.
B) penumbral lunar eclipse.
C) partial lunar eclipse.
D) partial solar eclipse.
E) annular eclipse.
C
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In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s. How long does it take for the train to be 180 m ahead of the car?
a. 2.0 s b. 3.0 s c. 6.0 s d. 9.0 s e. 18.0 s
Suppose there are a million habitable planets in our galaxy, that one in ten are habitable, that one in a thousand planets with life had at some point had an intelligent civilization, and that one in a hundred civilizations that has ever existed is
in existence now. Given this, how many civilizations are in existence now? A) 10 B) 1 C) 1000 D) 100
Which moons are sometimes called the Galilean moons?
A) the moons orbiting Uranus, which was once named "planet Galileo" B) the four largest moons of Jupiter: Io, Europa, Ganymede, and Callisto C) the moons that orbit their planet "backward" compared to their planet's rotation, such as Neptune's moon Triton D) the two largest moons in the solar system: Ganymede and Titan
In the figure, the radius of curvature of the curved part of the lens is 24.0 cm, and the refractive index of the lens material is 1.750. What is the focal length of the lens?
A) +32.0 cm B) -32.0 cm C) -16.0 cm D) +13.8 cm E) -13.8 cm