When two organ pipes each closed at one end sound a perfect fifth, such as two notes with fundamental frequencies at 440 Hz and 660 Hz, both pipes produce overtones. Which choice below correctly describes overtones present in both pipes?
a. 440, 880 and 1 320 Hz.
b. 660, 1 320 and 1 980 Hz.
c. 880, 1 320 and 1 760 Hz.
d. 1 320, 2 640 and 3 960 Hz.
e. They have no overtones in common.
E
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An incompressible fluid is flowing through a pipe with a constriction. The pipe is on an incline with an angle of 30.0 degrees. The narrow section is 10.0 m from the wide section and the narrow section is higher than the wide section. The velocity of the fluid in the wide section of the pipe is 4.00 m/s. The diameter of the wide section is 12.00 cm and the diameter of the narrow section is 9.00 cm. The pressure of the fluid in the wide section is 250 kPa. What is the pressure in the narrow section of the pipe? (density of the fluid is 1,000 
A. 210 kPa B. 205 kPa C. 195 kPa D. 184 kPa E. 175 kPa
What is the reason for the seasons on Earth?
a) Earth is cloest to the Sun in July, farthest from the Sun in January b) Earth is tilted with respect to the Sun by about 23.5 degrees c) Earth orbits the Sun more slowly in winter, faster in summer d) Earth rotates more slowly in winter, faster in summer e) Earth's Moon blocks more sunlight from reaching Earth in winter than in summer
The Group 7A element astatine (85At) would be predicted to occur in what phase?
a. Liquid b. Solid c. Plasma d. Gas
Convex (converging) lenses are worn by
A. a nearsighted person to make rays from a nearby object diverge less strongly. B. a farsighted person to make rays from a distant object diverge more strongly. C. a farsighted person to make rays from a nearby object diverge less strongly. D. a nearsighted person to make rays from a distant object diverge more strongly.