A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s. What is the time constant for this circuit?
a.
1.5 s
b.
1.3 s
c.
1.7 s
d.
1.9 s
e.
2.9 s
b
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The oldest rocks on our crust are radioactively dated at about:
A) 200 million years old. B) one billion years old. C) 2.7 billion years old. D) four billion years old. E) 4.6 billion years old.
An astronomical unit (AU) is the average distance from the Earth to the Sun. An comet in orbit around the Sun has a perihelion (near point to the Sun) of 0.50 AU and an aphelion (far point from the Sun) of 5.0 AU. If the comet's orbital speed at aphelion is v, what is its speed at perihelion?
a. 11v c. 5.5v b. 10v d. 4.5v
The Dirac theory predicted that a positron would be
a. a negative electron in a negative energy state. b. a particle with same mass as an electron but with opposite charge. c. a particle with negative mass. d. All of the above.
When the equation Ga + Br2 ? GaBr3 is balanced, the total of all the coefficients (both written and "understood") is
a. 4. b. 3. c. 6. d. 7.