In the context of supernova explosions, the _____ is a young remnant, only about 960 years old and about 9 ly in diameter
A) Lagoon Nebula
B) Carina Nebula
C) Eagle Nebula
D) Crab Nebula
D
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A typical protostar may be several thousand times more luminous than the Sun. What is the source of this energy?
A) Chemical combustion of hydrocarbons B) Nuclear fusion in its core C) From the release of gravitational energy as the protostar continues to shrink D) The ionization of the gas as it heats up E) From nearby hot stars or supernovae that have initiated the star formation process
The gravitational force between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does d represent?
A) the universal gravitational constant B) the density of the smaller object C) the distance between the two objects D) the diameter of the larger object
A ball is thrown straight upward from ground level with a speed of 18 m/s. How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s B) 1.8 s C) 1.1 s D) 0.6 s
Exploration of this part of the atmosphere was conducted in the nineteenth century with hot-air balloons
a. Stratosphere b. Troposphere c. Mesosphere d. Thermosphere