The velocity of a particle (m = 10 mg, q = ?4.0 ?C) at t = 0 is 20 m/s in the positive x direction. If the particle moves in a uniform electric field of 20 N/C in the positive x direction, what is the particle's speed at t = 5.0 s?
a. 60 m/s
b. 20 m/s
c. 45 m/s
d. 40 m/s
e. 70 m/s
b
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The observation that outer parts of galaxies rotate faster than the observable mass within their orbit can pull them implies that ________.
A. in time, galaxies will develop spiral arms B. the masses of galaxies are larger than their luminous mass C. all galaxies will eventually develop a bulge D. galaxies are unstable E. None of these choices is correct.
Hubble's constant is a "constant" in that its value
A) is the same across all of space and does not change on human time scales. B) stays the same at all times. C) is a value calculated from models, and therefore not affected by observations. D) always stays the same unless the expansion rate is accelerating.
Even in degenerate matter, pressure depends on temperature
Indicate whether the statement is true or false
A uniform charge density of 500 nC/m3 is distributed throughout a spherical volume (radius = 16 cm). Consider a cubical (4.0 cm along the edge) surface completely inside the sphere. Determine the electric flux through this surface
a. 7.1 N / m2/C b. 3.6 N / m2/C c. 12 N / m2/C d. 19 N / m2/C e. 970 N / m2/C