What do we mean by accretion in the context of planet formation?
A) the formation of moons around planets
B) the solidification of ices, rocks, and metal from the gas of the solar nebular
C) the growth of the Sun as the density of gas increased in the center of the solar nebula
D) the growth of planetesimals from smaller solid particles that collided and stuck together
D
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Aristotle believed that objects falling to the ground fall at a constant rate of speed
a. True b. False Indicate whether the statement is true or false
All real images
a. cannot be focused on a screen. b. are erect. c. can be focused on a screen. d. are inverted.
Energy
a)is the same thing as power. b)is a vector quantity. c)is measured in the same units as work. d)has the same units of velocity. ?
According to current astronomical data, approximately how old is the universe?
A) 65 million years B) 6000 years C) 4.6 billion years D) 14 billion years