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

Physics & Space Science

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A change in motion requires a(n) ______________

Fill in the blank(s) with correct word

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science