Drinking alcohol is required to be radioactive because
A. it proves that it is not made of petroleum
B. it is healthier
C. it shows that the alcohol was "aged"
D. It is not required; just the opposite, alcohol for consumption must not be radioactive.
Answer: A. it proves that it is not made of petroleum
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What observational evidence supports the fact that our universe is static and unchanging?
a. detection of the cosmic microwave background (CMB) b. dark sky at night c. redshift of galaxies d. evolution of galaxies with distance e. None of the other choices are correct.
Which produces more force: driving into a very massive concrete wall with no "give," or having a head-on collision with an identical car moving toward you at the same speed?
A) car B) wall C) both the same D) need more information
A shock wave is produced when a wave source moves
A) nearly as fast as the waves it produces. B) as fast as the waves it produces. C) faster than the waves it produces. D) none of the above
Enrico says that positive charge is created when you rub a glass rod with silk, and that negative charge is simply the absence of positive charge. Rosetta says that negative charge is created and that positive charge is the absence of positive charge. (She has heard that Ben Franklin should have reversed the signs he associated with the charges.) Which one, if either, is correct?
a. Enrico, because there really is only one kind of charge. b. Rosetta, because there really is only one kind of charge. c. Neither: although no charge is present originally, both types of charge are created through friction. d. Both: only one type of charge is created by friction at any one time. e. Neither: both negative and positive charge are present simultaneously in all solid materials on Earth and the process described involves a transfer of charge, not the creation of charge.