In a color television tube, electrons are accelerated through a potential difference of 20,000 volts. With what velocity do the electrons strike the screen?
v = 0.27c
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N molecules of a monatomic gas A are mixed with the same number of molecules of a diatomic gas B in a container, and the mixture is held at a constant temperature T (which is about equal to room temperature). The molecules of gas A have mass mA, and the molecules of gas B have mass mB > mA Which gas has In each case, choose from one of the four answers below.
the greater value of 
A. The quantity is greater for gas A.
B. The quantity is greater for gas B.
C. The quantity is the same for both gases.
D. One does not know enough to compare the quantities.
What is the pseudoscience that contends the planets' positions in the sky at the time of a person's birth affect the individual's personality or future?
a. Astronomy b. Card reading c. Physics d. Astrology
An advantage a reflector has over a refractor is the elimination of ________
Fill in the blank(s) with correct word
The allowed shapes for the orbits of objects responding only to the force of gravity are
A) ellipses, parabolas, and hyperbolas. B) ellipses only. C) ellipses, spirals, and parabolas. D) circles and ellipses.