Two stars both lie on the main sequence. Star X is spectral type A, while Star Y is spectral type G. Therefore, Star X is more massive than Star Y
Indicate whether the statement is true or false
TRUE
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If luminosity depends on radius and temperature, what does flux depend on? _______________
Fill in the blank(s) with correct word
If the ac peak voltage across a 100-ohm resistor is 120 V, then the average power dissipated by the resistor is
A) 102 W. B) 288 W. C) 72 W. D) 144 W. E) 220 W.
Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true?
A) The supergiant would appear as large as the full Moon in our sky. B) Earth would fly off into interstellar space. C) The supergiant's surface temperature would be much hotter than the surface temperature of our Sun. D) Earth would be inside the supergiant.
Which of the following best characterizes electrical insulators?
a. charges on the surface don't move b. high tensile strength c. electric charges move freely d. good heat conductors