A star system where we observe the magnitude to increase and decrease is a(n) ________
Fill in the blank(s) with correct word
eclipsing binary
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The loop is entirely inside the field.
A. forward (in the +x direction). B. backward (in the -x direction). C. zero. D. some other direction (specify).
Two point charges, separated by 15 cm, have charge values of +2.0 µC and -4.0 µC, respectively. What is the value of the mutual force between them? (ke = 8.99 × 10^9 N×m2/C2)
a. 8.0 × 10^-12 N c. 320 N b. 3.6 × 10^-8 N d. 3.2 N
During a formal website usability and design professionals observe exactly how visitors use a website.
Answer the following statement true (T) or false (F)
What change slowly occurs during the main-sequence lifetime of a star?
A) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity. B) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. C) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. D) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity.