A 20.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the third mode?
A. 2,070 Hz
B. 2,190 Hz
C. 2,320 Hz
D. 2,450 Hz
E. 2,680 Hz
A. 2,070 Hz
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In relativity, two people share the same reference frame only if what is true?
A) They are not moving relative to one another. B) They are both located in the same place. C) They are both located in the same place and are stationary. D) They agree on the laws of nature.
The distance to a star with a parallax angle of 0.2 arc seconds is
A) 0.2 parsec. B) 2 parsecs. C) 5 parsecs. D) 12 parsecs. E) 20 parsecs.
A billiard ball is moving in the x-direction at 33.4 cm/s and strikes another billiard ball moving in the y-direction at 38.9 cm/s. As a result of the collision, the first ball moves at 50.6 cm/s, and the second ball stops. In what final direction does the first ball move?
a. in the x-direction b. at an angle of 49.4° ccw from the x-direction c. at an angle of 40.6° ccw from the x-direction d. at an angle of 56.6° ccw from the x-direction e. Such a collision cannot happen.
What types of stars end their lives with supernovae?
A) all stars that are red in color B) all stars that are yellow in color C) high-mass stars that can continue to have core fusion until they have iron cores D) stars that are similar in mass to the Sun E) stars that have reached an age of 10 billion years