A candle is 32.0 cm in front of a convex spherical mirror of radius of curvature 68.0 cm. What are the image distance and the magnification, respectively?
a. –16.5 cm, + 0.515
b. –21.8 cm, – 1.94
c. –36.0 cm, + 0.242
d. –1.9 cm, + 1.94
e. 16.5 cm, – 0.515
a
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A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about the circuit?
A) Once the capacitor is essentially fully charged, there is no current in the circuit. B) The potential difference across the resistor is always equal to the potential difference across the capacitor. C) Current flows through the circuit even after the capacitor is essentially fully charged. D) The capacitor charges to its maximum value in one time constant. E) The capacitor charges to its maximum value in two time constants.
If we compress the entire history of the universe into one year, modern humans evolved
A) at 9 PM on New Year's Eve B) at midnight on New Year's Eve C) a couple of minutes before midnight on New Year's Eve D) a few seconds before midnight on New Year's Eve
The reason that most extrasolar planets discovered by the transit technique are found close to their parent stars is
A) the closer to a star, the hotter and therefore brighter the planet is. B) they transit more frequently, and have thus been more likely to be detected in the short time we have been searching for them. C) the wavelength shift of the star's spectrum is larger. D) planets that are close to a star are heated up and therefore larger. E) more of the starlight is blocked by the planet when it transits the star.
When an ideal gas is compressed isothermally:
A. the internal energy of the gas does not change. B. the work done on the gas is zero. C. heat flows into the gas. D. the temperature of the gas increases.