As a moon in a very elliptical orbit moves closer to and then farther from a planet, gravity flexes the moon with tides, and friction heats the interior. This process is referred to as
a. tidal heating.
b. occultation.
c. vaporization.
d. differentiation.
e. sublimation.
a
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A strip of fur is rubbed against a hard rubber rod. The rod thereby acquires a negative charge because
A. rubbing caused electrons to move from the fur to the rod. B. friction caused protons to be removed from the rod. C. electrons from the air molecules are transferred to the rod. D. frictional forces create electrons.
Seen from the northern latitudes (mid-northern hemisphere), the star Polaris
a. is never above the horizon during the day. b. always sets directly in the west. c. is always above the northern horizon. d. is never visible during the winter. e. is the brightest star in the sky.
Which of the following hypothetical observations would contradict current understanding of the nature of white dwarfs?
A) discovery of a white dwarf with a mass of 1.5 MSun B) discovery of a white dwarf with a surface temperature of 6000 K C) discovery of a white dwarf at the center of a planetary nebula D) discovery of a white dwarf with a 1.5 MSun mass main-sequence companion
What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of -16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 180,000 N/C B) 5100 N/C C) 1.8 × 1014 N/C D) -180,000 N/C E) -5100 N/C