Most of the elements found on Earth were created
A. in the first few million years of the Earth's existence
B. within a star
C. in the Big Bang
D. in a supernova explosion
Answer: B. within a star
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In the development of a terrestrial planet, the stage of ___________ occurred when molten rock flowed through fissures and filled deep basins
a. differentiation b. cratering c. glaciation d. accretion e. flooding
Which molecule is most polar?
A) S=C=S B) O=C=O C) O=C=S D) These all have the same polarity.
A merry-go-round spins freely when Janice moves quickly to the center along a radius of the merry-go-round. It is true to say that
A) the moment of inertia of the system decreases and the angular speed increases. B) the moment of inertia of the system decreases and the angular speed decreases. C) the moment of inertia of the system decreases and the angular speed remains the same. D) the moment of inertia of the system increases and the angular speed increases. E) the moment of inertia of the system increases and the angular speed decreases.
A 200-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 18.0°. What is the coefficient of static friction between box and ramp?
a. 0.42 b. 0.32 c. 3.1 d. 0.27 e. 62