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

Physics & Space Science

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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.

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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.

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Even in degenerate matter, pressure depends on temperature

Indicate whether the statement is true or false

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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

Physics & Space Science