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1

If one thousand people were observed at random times of day, about how many of them would be observed to be eating?
2

Suppose a star has the same mass as the Sun but has a diameter 5 times as large. Compare the total gravitational energy radiated away by the star with that radiated away by the Sun.
3

Suppose the Sun were to shrink to 50% of its present diameter. How would the gravitational energy released during that contraction compare with the gravitational energy released during the Sun’s contraction to its present diameter?
4

Star A is 3 times as massive and 60 times as luminous as star B. How do the lifetimes of the two stars compare?
5

Main sequence star A is 5 times as massive as main sequence star B. How do the main sequence lifetimes of the two stars compare?





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