General relativity explains the observed precession of the orbit of:
A) Pluto.
B) Jupiter.
C) Earth.
D) Mercury.
E) Io.
D
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By studying distant galaxies in the 1920s, Hubble made which of the following important discoveries that led us to conclude that the universe is expanding?
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies were born at the same time, and all will die at the same time. C) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. D) All galaxies outside the Local Group are orbiting the Local Group. E) All galaxies outside the Local Group are moving away from us, and all are moving away at nearly the same speed.
A flatbed truck is carrying a 20.0-kg crate down a sloping road inclined 15.0° below the horizontal. The coefficient of static friction between the crate and the bed is 0.400
What is the maximum acceleration that the truck can have if the crate is to stay in place? A) 1.25 m/s2 B) 0.625 m/s2 C) 2.50 m/s2 D) 3.16 m/s2 E) 6.33 m/s2
In structure, our Milky Way is most similar to:
A) the Large Magellanic Cloud. B) an upscale version of a globular cluster. C) M-31, the Andromeda Galaxy. D) the Orion nebula. E) None of these.
__________is one of the ice giants of the Solar System
A) Saturn B) Uranus C) Pluto D) Mercury