A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the particle at t = 2.0 s?
a. 81 m/s
b. 72 m/s
c. 64 m/s
d. 89 m/s
e. 25 m/s
C
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An electron is accelerated from rest through a potential difference of 1.02 MeV. If the rest energy of the electron is 0.51 MeV, how fast is the electron moving?
A. 0.57 c B. 0.30 c C. 0.67 c D. 0.90 c E. 0.94 c
For a few hundred thousand years after the Big Bang, atoms could not form. Electrons could not stay bound to protons or helium nuclei. However, eventually, atoms did combine when
A. there was enough angular momentum that protons and electrons acquired spins. B. the universe had expanded and cooled sufficiently. C. the theory of everything became active. D. the curvature of spacetime increased by 50%.
Why do prominences appear pink during a solar eclipse?
a. Because of the high temperature of the gases b. Because the photosphere being blocked out c. Because of the placement of the lunar disk over the Sun d. Because the prominences interact with Earth's magnetic field e. Because different gases are being combined in the chromosphere
An astronomer named _______________ used globular clusters to locate the center of the galaxy. (enter last name only)
Fill in the blank(s) with correct word