Which of the following best describes how galaxies are distributed on large scales in the universe?
A) Galaxies are uniformly distributed throughout space.
B) Galaxies are randomly distributed throughout space.
C) Galaxies are distributed in large, elongated chains radiating outward from a common center.
D) Galaxies appear to be distributed in chains and sheets that surround great voids.
E) Galaxies are distributed in a series of concentric spherical shells around a common center.
D) Galaxies appear to be distributed in chains and sheets that surround great voids.
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A charged particle (m = 5.0 g, q = ?70 ?C) moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s2 downward, the electric field is 700 N/C upward, and the magnetic field is perpendicular to the velocity of the particle. What is the magnitude of the magnetic field in this region?
A. 47 mT B. zero C. 23 mT D. 35 mT E. 12 mT
A galvanometer with a coil resistance of 80 ? deflects full-scale for a current of 2.0 mA. What series resistance is required to convert it to a voltmeter reading full scale for 200 V
A) 100 m? B) 13 M? C) 250 k? D) 0.80 m? E) 100 k?
Why do stars in the central bulge have a lower metallicity than stars in the disk?
What will be an ideal response?
How far does a beam of light travel in one full year?
A) 80 × 1012 m B) 95 × 1014 m C) 30 × 108 m D) 20 × 1015 m E) 36 × 1016 m