What is the distance between a node and an antinode?
A. wavelength/1
B. wavelength/2
C. wavelength/3
D. wavelength/4
D. wavelength/4
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A circuit consists of an AC audio amplifier, a resistor, and a speaker, all in series. The amplifier puts out an alternating voltage of 16.0 V (rms), the resistance of the resistor is 10.0 ?, and the speaker has a resistance of 11.9 ?. What is the time-averaged power delivered to the speaker?
a. 21.5 W b. 30.5 W c. 6.35 W d. 8.69 W
At what temperature is the rms speed of hydrogen molecules, which have a molecular weight of 2.02 g/mole, equal to 2000 m/s?
A) 17.0°C B) 34.0°C C) 51.0°C D) 68.0°C E) 72.0°C
Which of the following is not considered crucial for life to exist on some world?
A) a liquid, such as liquid water B) a source of energy that can be used by life C) a source of nutrients D) an atmosphere
A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will
A) contain only a north pole. B) contain a north pole on the right and a south pole on the left. C) contain only a south pole. D) no longer contain any poles.