Why do Earth and Venus have active interiors, while Mercury and Mars do not?
A. Earth and Venus have rapid rotations, while Mercury and Mars do not.
B. Earth and Venus are much more massive, and cool more slowly, than Mars and Mercury.
C. Mercury and Mars have small iron cores, while Earth and Venus have large ones.
D. All of these choices are correct.
E. None of these choices is correct.
Answer: B
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Calculate the energy (in kW?h) given off if five kg of plutonium-239 undergoes complete fission. The energy released per fission is 200 MeV. (1 MeV = 1.6 × 10^?13 J)
a. 1.1E+11 kW?h b. 6.4E+12 kW?h c. 1.6E+16 kW?h d. 1.1E+8 kW?h e. 5.4E+9 kW?h
A star has a parallax of 0.08 arc seconds. What is its distance?
A. 8 light-years B. 80 parsecs C. 12.5 parsecs D. 125 parsecs E. 8 parsecs
Why do some people think that cogeneration is a useful strategy for dealing with energy generation? Explain
What will be an ideal response?
Metal alloys dispersion strengthened with oxide particles are usually produced by _________metallurgy techniques.
Fill in the blank(s) with the appropriate word(s).