21. when does a nuclear fission reaction occur? a. when a nucleus is cut in two using a really sharp knife. b. when two nuclei collide and combine to one. c. when a large nucleus spontaneously is divided for no apparent reason. d. when the electric forces within the nucleus are stronger than the nuclear forces.
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Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.
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Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.
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How might this scientific phenomena be explained? a paper clip floats on water.
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21. when does a nuclear fission reaction occur? a. when a nucleus is cut in two using a really shar...
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