If there were no gravity, a ball thrown upward at an angle would follow a straight-line path. Due to gravity, however, at the end of 1 s it is
A) 5 m below the straight line.
B) 10 m below the straight line.
C) 15 m below the straight line.
D) 20 m below the straight line.
E) more than 20 m below the straight line.
Answer: A
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Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type
a. True b. False Indicate whether the statement is true or false
Pulsating variable stars are useful in determining
a. the mass of a star for which the distance is known. b. the temperature of a star for which we know the luminosity. c. the radius of the bulge of our galaxy. d. the distance to globular clusters. e. the mass of the Milky Way galaxy.
How does the spectrum of a molecule differ from the spectrum of an atom?
A) A molecule does not have spectral lines due to electrons changing energy levels. B) A molecule has additional spectral lines due to changes in its rotational and vibrational energies. C) Molecules only have spectral lines at ultraviolet wavelengths. D) Most atoms only have spectral lines at infrared wavelengths. E) An atom has a wider range of spectral lines than molecules.
An object moving in simple harmonic motion has an amplitude of 0.0450 m and a maximum acceleration of 40.0 m/s2 . What is the frequency of the system?
a. 14.9 Hz b. 187 Hz c. 4.75 Hz d. 11.9 Hz e. 1.80 Hz