An important underlying feature of hydraulic devices is the conservation of
A) pressure.
B) momentum.
C) energy.
D) all of the above
E) none of the above
Answer: C
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The graphs below show angular velocity as a function of time. In which one is the magnitude of the angular acceleration constantly decreasing?
A.
B.
C.
D.
E.
What is the wavelength in meters, of a sound wave (v = 340 m/s) with a frequency of 4 Hz?
a. 85 Hz b. 1360 Hz c. 340 Hz d. 0.012 Hz
The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal. B) always are in the red part of the visible spectrum. C) have wavelengths that are shorter than normal. D) have a higher intensity in the red part of the spectrum.
The discovery of the cosmic microwave background was important because
A) its detection was a major advance in microwave testing. B) it was experimental verification of a prediction from the Big Bang theory. C) it showed the universe must be closed, with more than the critical density here. D) it established a firm center of the universe. E) it proved that astronomy at radio wavelengths was possible.