Which of the following is true of a comet nucleus?
A) It is in its gaseous form when it is far from the Sun.
B) It remains inactive while it is far from the Sun.
C) It causes the tail of the comet to point toward the Sun.
D) It is mainly composed of nonvolatile compounds.
B
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The Sun's complete classification is G2V
Indicate whether the statement is true or false
A radioactive isotope is
A) an unstable nucleus that gives off radio waves B) a nucleus that formed from the fusion of two other nuclei C) a stable nucleus that is formed from the fission of a large unstable nucleus D) an unstable nucleus that spontaneously breaks apart
At what rate is thermal energy generated in the 5-? resistor when ? = 24 V?
A. 13 W B. 3.2 W C. 23 W D. 39 W E. 51 W
A solid cylindrical bar conducts heat at a rate of 25 W from a hot to a cold reservoir under steady state conditions
If both the length and the diameter of this bar are doubled, the rate at which it will conduct heat between these reservoirs will be A) 200 W B) 100 W C) 50 W D) 25 W E) 12.5 W