Imagine that we launch a spaceship from the earth so its speed is 6 AU/y relative to the earth in the direction that the earth orbits the sun. This spaceship’s subsequent orbit around the sun is:
A. Circular
B. Elliptical
C. Parabolic
D. Hyperbolic
D. Hyperbolic
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Our Sun is a first-generation star.
Answer the following statement(s) true (T) or false (F)
Luminosity (absolute brightness) of a star depends on its ________.
A. temperature and radius B. radius and distance C. mass and age D. distance and mass E. age and temperature
Three resistors are connected in series in a circuit. The resistors A, B, and C have resistances R, 2R, and 3R, respectively. Which resistance dissipates the most power?
1.A 2.B 3.C 4.They all dissipate the same power when in series.
As the universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as
a. ionization. b. isotropy. c. annihilation. d. recombination. e. hydration.