A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass of the man-board system?
A) 1.25 m
B) 2.50 m
C) 5.00 m
D) 7.50 m
E) 9.00 m
A
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We know that Earth has water. However, according to our theory of solar system formation, the inner solar system was too hot for hydrogen compounds like water to condense. What do we conclude?
A) Water arrived on Earth at a time when it rained throughout the inner solar system. B) Earth's water likely was brought here by asteroids or comets that formed beyond the frost line. C) Our theory of solar system formation will need modification because it is unable to account for the existence of water on Earth. D) Earth's water probably originated through chemical reactions among the rock and metal of Earth's interior.
About how long is the solar cycle (evidenced by the polarity of the Sun's magnetic field)?
A. 3 years B. 22 years C. 5 days D. 11 years
What is a superbubble?
A) a very low-density region of interstellar space, formed by the merger of several bubbles B) a very high-density region of interstellar space, filled with gas ejected from nearby star systems C) a bubble so large that it fills much of the galactic halo D) the region of space cleared by a powerful supernova E) a cloud of gas that can form a million or more stars
Orbital electrons do not spiral into the atomic nucleus because of
1) electrical forces, 2) the wave nature of the electrons, 3) angular momentum, 4) the discreteness of energy levels, 5) quantum mechanical laws, and the electrons have discrete radii from the nucleus because 6) the circumference of each orbit is an integral multiple of the electron wavelength. 7) electrical forces act over discrete distances. 8) energy levels themselves are discrete.