How does the traditional theory of the formation of the galaxy explain the origin of globular clusters?
a. They formed in the disk and later were ejected to the halo.
b. They formed in other galaxies and were captured by close interactions.
c. They build over time from the collision of stars in the halo.
d. They formed early on during the free-fall collapse of the proto-galactic material.
D
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Gravitational lensing
a. occurs when light passes near a massive object and is deflected by the object's gravitational field. b. can be used to determine the luminosity of a galaxy. c. occurs when the mass of a galaxy is greater than expected from the luminosity of the galaxy. d. occurs when the mass of a galaxy is less than expected from the luminosity of the galaxy. e. can be used to determine the recessional velocity of a galaxy.
How is density determined, and how do the densities of the terrestrial and jovian worlds relate to their distances from the Sun?
What will be an ideal response?
A track star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth?
What will be an ideal response?
Express 50 mi/h in units of meters per second. (1 mi = 1609 m)
A) 49 m/s B) 2.2 m/s C) 22 m/s D) 45 m/s