All stars spend approximately the same amount of time on the main sequence
Indicate whether the statement is true or false
FALSE
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Of the Galilean moons, the one with striking grooved terrain and icy tectonic features as well as older craters is:
A) Amalthea. B) Io. C) Europa. D) Ganymede. E) Callisto.
Radiation: The radius of a star is 6.95 × 108 m, and its rate of radiation has been measured to be 5.32 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of this star? (? = 5.67 × 10-8 W/m2 ? K4)
A. 6.27 × 103 K B. 8.25 × 103 K C. 8.87 × 103 K D. 3.93 × 107 K E. 5.78 × 107 K
An Earth satellite in an elliptical orbit travels fastest when it is
A) nearest the Earth. B) farthest from the Earth. C) neither of these
Entropy: When 1.0 kg of steam at 100°C condenses to water at 100°C, what is the change in entropy of the steam? The latent heat of vaporization of water is 22.6 × 105 J/kg.
A. zero B. 6.1 × 103 J/K C. -6.1 × 103 J/K D. 22.6 × 105 J/K E. -22.6 × 105 J/K