What is the mass of a 1.25 m long piano wire that has a fundamental frequency of 256 Hz when under a tension of 138 N?
A. 6.4 g
B. 1.7 g
C. 3.4 g
D. 41 g
E. 4.1 g
B. 1.7 g
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Which of the following is true of the Terrestrial planets?
A) The smaller Terrestrial planets have molten cores. B) The smaller Terrestrial planets tend to be geologically active. C) The larger Terrestrial planets have solid cores. D) The larger Terrestrial planets tend to be geologically active.
In a Hertzsprung-Russell (H-R) diagram, a star is represented by a _____ on the graph that tells you its luminosity and temperature
A) cross B) broken line C) point D) dotted line
Tiny grains of zirconium silicate (zircons) found embedded in sedimentary rocks have been radiometrically dated to what age?
A) 4.57 billion years ago B) 3.85 billion years ago C) 4.38 billion years ago D) 4.02 billion years ago
An amateur astronomer grinds a double convex lens whose surfaces have radii of curvature of magnitudes 40 cm and 60 cm. The glass has an index of refraction of 1.54. What is the focal length of this lens when used in the night air?
A) 220 cm B) 43 cm C) 130 cm D) 89 cm E) 44 cm