Conservation of angular momentum explains why the contracting solar nebula's rotation rate increased as it contracted
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TRUE
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Two loudspeakers are placed facing each other and driven by the same source at 680 Hz. A listener is positioned between the two speakers on the line separating them, thus creating a constructive interference at the listener's ear. If one of the speakers is gradually pushed toward the listener, how far must it be moved to repeat the condition of constructive interference at the listener's ear?
(The speed of sound = 340 m/s.) a. 0.13 m c. 0.50 m b. 0.25 m d. 1.00 m
A long solenoid has a radius of 4.0 cm and has 800 turns/m. If the current in the solenoid is increasing at the rate of 3.0 A/s, what is the magnitude of the induced electric field at a point 2.2 cm from the axis of the solenoid?
a. 3.3 × 10^-5 V/m b. 3.6 × 10^-5 V/m c. 3.9 × 10^-5 V/m d. 4.2 × 10^-5 V/m e. 6.0 × 10^-5 V/m
The chromosphere of the sun
a. is hotter than the photosphere. b. appears yellow-white in color during total solar eclipse. c. is the visible surface of the sun. d. produces an absorption spectrum. e. all of the above
Earth's magnetic field has reversed itself
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