The outward pressure of hot gas in the Sun:
A) is balanced by the inward gravitational pressure.
B) is increasing the Sun's diameter.
C) is cooling the photosphere.
D) is responsible for variations in the sunspot cycle.
E) weakens the magnetic field.
A
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When two organ pipes each closed at one end sound a perfect fifth, such as two notes with fundamental frequencies at 440 Hz and 660 Hz, both pipes produce overtones. Which choice below correctly describes overtones present in both pipes?
a. 440, 880 and 1 320 Hz. b. 660, 1 320 and 1 980 Hz. c. 880, 1 320 and 1 760 Hz. d. 1 320, 2 640 and 3 960 Hz. e. They have no overtones in common.
An object moves in a direction parallel to its length with a velocity that approaches the velocity of light. The width of this object, as measured by a stationary observer,
A) approaches infinity. B) approaches zero. C) increases slightly. D) decreases slightly. E) does not change.
Transits of multiple planet systems can be analyzed to infer planetary masses
Indicate whether the statement is true or false
A charged comb attracts bits of neutral dust in the air. This happens because
A. the dust becomes polarized. B. the dust is a good conductor. C. the dust becomes charged by induction. D. the dust grounds the comb.