All people come very close to being able to float in water. What therefore is the volume (in cubic meters) of a 50-kg woman?
a. 0.007
b. 0.035
c. 0.050
d. 0.070
e. 0.085
c
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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.
The most significant difference between the astronomical theories of Ptolemy and Copernicus is
A) Ptolemy's is not based on scientific evidence, while Copernicus's is. B) Ptolemy's theory does away with many of the complexities of the Copernican theory. C) Ptolemy's theory is sun-centered, whereas Copernicus's is Earth-centered. D) Ptolemy uses circular planetary orbits while Copernicus uses elliptical orbits. E) Ptolemy's theory is Earth-centered, whereas Copernicus's is sun-centered.
During a positron emission tomography (PET) scan of the brain,
A) an external positron beam is sent through the patient's brain and detected as it leaves the patient. B) matter and antimatter annihilate within the brain to create positrons that are detected as they leave the patient. C) radioactive fluorine creates positrons within the brain that are detected as they leave the patient. D) positrons and electrons annihilate within the brain to create gamma photons that are detected as they leave the patient. E) highly sensitive detectors measure the positrons that are naturally emitted by the human body.
Supernova remnants differ from star forming regions because, although there is ionized hydrogen in both, supernova remnants:
A) don't look like star forming regions. B) are much bigger than star forming regions. C) are located far from star forming regions. D) are more diffuse than star forming regions. E) contain no ionizing stars.