A barrier that blocks or restricts the downstream movement of a stream
What will be an ideal response?
Dam
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Why is the production of iron important for understanding the explosion of massive stars?
What will be an ideal response?
Consider two different isotopes of the same neutral element. Which statements about these isotopes are true? (There may be more than one correct choice.)
A) Both isotopes contain the same number of orbital electrons. B) The sum of the protons and neutrons is the same for both isotopes. C) Both isotopes contain the same number of protons. D) Both isotopes contain the same number of neutrons. E) Both isotopes contain the same number of nucleons.
The most important reason that an alpha particle can be stopped by a single sheet of paper while an electron of the same energy might not be stopped by hundreds of sheets of paper is that the alpha particle
A. Is a nucleus, while the electron is not. B. Moves more slowly than the electron. C. Interacts more strongly than the electron does. D. Has greater mass than the electron. E. Has more charge than the electron.
An 800-MW electric power plant has an efficiency of 30%. It loses its waste heat in large cooling towers. Approximately how much waste heat (in MJ) is discharged to the atmosphere per second?
a. 1 200 b. 1 900 c. 800 d. 560 e. 240