Globular clusters have approximately how many stars?
a. 100,000 – 1,000,000
b. 10,000 – 90,000
c. 5,000 – 10,000
d. 1000 - 5000
e. less than 1000
a
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Which of the following describes a star with a hydrogen-fusing shell and an inert (nonfusing) helium core?
A) It is a subgiant that grows in luminosity until helium fusion begins in the central core. B) It is a red giant that grows in luminosity until it dies in a planetary nebula. C) It is a subgiant that gradually grows dimmer as its hydrogen-fusing shell expands and cools. D) It is what is known as a helium core-fusion star, which has both helium fusion in its core and hydrogen fusion in a shell.
Discuss the important features that allow space-based telescopes to search for transiting exoplanets
What will be an ideal response?
Two small balls, A and B, attract each other gravitationally with a force of magnitude F. If we now double both masses and the separation of the balls, what will now be the magnitude of the attractive force on each one?
A) 16F B) 8F C) 4F D) F E) F/4
If the average velocity is non-zero over a time interval, does this mean that the instantaneous velocity is never zero over that same time interval?
A. Yes B. No