Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 1536 Hz. You move between the speakers, along the line joining them, at a constant speed of 2.8 m/s
What beat frequency do you observe? The speed of sound in the room is 330 m/s. A) 13 Hz
B) 431 Hz
C) 26 Hz
D) 4.7 Hz
E) 118 Hz
C
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What is the resistance of the combination of resistors?
A. 4.0 
B. 12
C. 13
D. 14
E. 15
The _______________ model explains pulsars using beams of radiation that sweep around the sky
Fill in the blank(s) with correct word
One mole of "o" gas is confined to volume V/2 by a thin membrane with one mole of "x" gas on the other side. Both gases are at the same temperature
Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?
A) Determining longitude requires mathematical techniques that were not known at the time. B) Determining longitude requires much more precise measurements of angles in the sky than does latitude. C) Determining longitude requires accurate tables of the celestial coordinates of stars, while determining latitude does not. D) Determining longitude requires an accurate clock, but latitude does not.