When four hydrogen nuclei fuse to make helium, a small amount of matter is lost. What is the mass difference and energy generated? The mass of hydrogen and helium nuclei are 1.67 1027 kg and 6.646 1027 kg, respectively.
a. 0.034 1027 kg, 3 1012 J b. 0.022 1027 kg, 2 1012 J
c. 0.068 1027 kg, 6 1012 J d. 0.011 1027 kg, 1 1012 J
Question 2
Classical Greek astronomers believed the motions of the heavens could be described by uniform circular motion.
a. True
b. False
Indicate whether the statement is true or false
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