What is the lowest frequency that will resonate in an organ pipe 1.00 m in length, closed at one end? The speed of sound in air is 340 m/s
a. 42.5 Hz
c. 170 Hz
b. 85.0 Hz
d. 680 Hz
B
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A stone initially moving at 8.0 m/s on a level surface comes to rest due to friction after it travels 11 m. What is the coefficient of kinetic friction between the stone and the surface?
A) 0.13 B) 0.25 C) 0.30 D) 0.43 E) 0.80
How is antimatter created?
What will be an ideal response?
A string is held taut between two supports 2.0 m apart. The longest and next-longest possible wavelengths for standing waves are
A. 6 m and 3 m. B. 16 m and 5.3 m. C. 4 m and 2 m. D. 8 m and 4 m.
What makes dark matter and dark energy so mysterious and so important?
A. We don't exactly know what they are, but they are the determining factors of the stellar evolution and planet formation. B. We don't have strong evidence that they exist, but they could influence the motion of stars in Milky Way Galaxy. C. We don't exactly know what they are, and they make up the majority of the total energy content of the universe. D. We don't have strong evidence that they exist, and they could strongly influence the processes occurring in our Solar System.