An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
how long does it take to traverse the plates?
A. 2.00 ?s
B. 2.00 ns
C. 1.70 ns
D. 1.80 ns
E. 1.50 ?s
B. 2.00 ns
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Compared to the central regions of spiral galaxies, we expect elliptical galaxies to have
A) higher mass-to-light ratios because stars in elliptical galaxies are dimmer than those in spirals. B) lower mass-to-light ratios because stars in elliptical galaxies are dimmer than those in spirals. C) higher mass-to-light ratios because stars in elliptical galaxies do not have high orbital velocities. D) lower mass-to-light ratios because elliptical galaxies have less gas and dust than spirals. E) the same mass-to-light ratio because they are made of the same material, stars and dark matter.
Magnetic Field of a Long Wire: The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10-3 T. How much current is flowing through the wire? (?0 = 4? × 10-7 T ? m/A)
A. 30 mA B. 190 mA C. 19 mA D. 380 mA
One advantage of the Hubble Space Telescope over ground based ones is that
A) it can make better observations of the ozone layer. B) it can better focus X-ray images. C) its adaptive optics controls atmospheric blurring better. D) in orbit, it can operate close to its diffraction limit at visible wavelengths. E) it is larger than any Earth-based telescopes.
Objects moving at relativistic speeds appear to observers at rest to be
A) stretched. B) shrunken. C) either depending on direction of motion. D) none of the above