Which of the following statements about nuclear fusion is not true?
A. It involves two or more small atomic nuclei slamming into each other and sticking together to make a larger atomic nucleus.
B. It refers solely to the process of converting hydrogen into helium.
C. It is the process that has made most of the elements of which we and the Earth are made.
D. It is the process that generates the energy by which our Sun shines.
Ans: B. It refers solely to the process of converting hydrogen into helium.
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A 1,800 kg car is traveling at 20.0 m/s NORTHEAST. The momentum of the car is
A. 18,000 kg m/s NORTHEAST. B. 20,000 kg m/s NORTHEAST. C. 28,000 kg m/s NORTHEAST. D. 32,000 kg m/s NORTHEAST. E. 36,000 kg m/s NORTHEAST.
Two flat glass plates are in contact along one end and are separated by a sheet of tissue paper at the other end. A monochromatic source of wavelength 427 nm illuminates the top plate. If 11 dark bands are counted across the top plate, what is the paper thickness? (1 nm = 10?9 m)
a. 4.3E–6 m b. 1.7E–6 m c. 2.1E–6 m d. 2.6E–6 m e. 1.3E–6 m
According to the law of charges, unlike charges ______________
Fill in the blank(s) with correct word
Melting and freezing are
A) changes of phase. B) opposite processes. C) both of these D) neither of these