According to Olbers's paradox, the night sky should:
A) be pitch black.
B) be black with tiny stars.
C) be glowing blindingly bright.
D) have alternate phases of brightness and darkness.
C
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A change in motion requires a(n) ______________
Fill in the blank(s) with correct word
The magnetic fields carried by jets coming from active galactic nuclei are generated by:
A) the combined magnetic fields of the many stars near the galaxy's center. B) the central black hole. C) the movement of the interstellar matter of the galaxy. D) the movement of the stars in the galaxy. E) charged matter in the accretion disk of the central black hole.
A satellite is held in orbit by a 1 000-N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:
a. 1.0×108 J. b. 8.0×108 J. c. 1.0×1011 J. d. 0. e. 8.0×1011 J.
A parallel plate capacitor with circular plates having radius 0.07 m and a dielectric with constant 2.2. If it is desired to store 
J in this capacitor, what must the separation distance be for a voltage of 1.5 kV?
A. 2.8 cm B. 5.5 cm C. 1.3 cm D. 0.90 cm E. 1.4 cm