The terrestrial planets are made almost entirely of elements heavier than hydrogen and helium. According to modern science, where did these elements come from?
A) They were produced by gravity in the solar nebula as it collapsed.
B) They were produced by stars that lived and died before our solar system was born.
C) They have been present in the universe since its birth.
D) They were made by chemical reactions in interstellar gas.
B
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Acceleration: Suppose that an object is moving with a constant velocity. Which statement concerning its acceleration must be correct?
A. The acceleration is constantly increasing. B. The acceleration is constantly decreasing. C. The acceleration is a constant non-zero value. D. The acceleration is equal to zero.
Asteroids are thought to be
a. the remains of a planet between Mars and Jupiter that broke up. b. escaped small moons. c. leftover planetesimals from the inner solar system. d. leftover planetesimals from the outer solar system.
A microscope has an objective lens of focal length 1.4 mm and an eyepiece of focal length 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mm from the objective
How far apart are the lenses? A) 20 mm B) 21 mm C) 23 mm D) 33 mm E) 41 mm
One of the problems with adopting a one-dimensional biological causal model of abnormality is...
a). it ignores that contributions of psychological & sociocultural factors to the disorder b). it ignores any interactions with other contributing factors c). it ignores any environmental influences on the disorder d). all of these e). none of these