Why is Galileo Regio, the large circular feature on Ganymede, so dark?
A) It is composed of dense basaltic mantle rock that once flowed like lunar mare.
B) It is the result of micrometeorite dust settling onto it over several billion years.
C) It has an asphalt-like material that is like the dark side of Iapetus of Saturn.
D) It is the result of ultraviolet light from the Sun interacting with the ice and creating a substance that is quite dark.
E) It is the site of a recent meteorite impact that scattered a lot of dark, rocky material.
B
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A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?5.5 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m b. 28 m c. 44 m d. 12 m e. 88 m
The Algol paradox is explained by considering
a. the degenerate nature of the hydrogen on the surface of the white dwarf. b. synchrotron radiation c. the rate of expansion of the shock wave inside the supernova. d. the rotation rate of a neutron star. e. mass transfer between the two stars in a binary system.
Is this a photo of a spiral galaxy or an elliptical galaxy, and how do you know?
A) It is a spiral galaxy because we can see a dusty disk going across the center. B) It is a spiral galaxy, and we know because photos of this same galaxy from above show its spiral arms. C) It is an elliptical galaxy because it is elliptical in shape. D) It is an elliptical galaxy because it looks red/yellow in color.
When light enters a medium with a higher index of refraction it
A. is absorbed. B. is bent towards the normal. C. continues in the same direction. D. is bent away from the normal.