Type I supernovae can be used to determine distances to galaxies much better than type II supernovae
Indicate whether the statement is true or false
TRUE
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An object of mass m is hanging by a string from the roof of an elevator. The elevator is increasing its upward speed. What is the tension in the string?
A. greater than mg B. less than mg C. equal to mg D. depends on the speed of the elevator
The fact that the lunar phases repeat on the same solar dates about every 19 years (the Metonic cycle) can be used to __________.
a. predict the future orientation of the Earth's axis in space b. keep lunar calendars approximately synchronized with solar calendars c. predict the dates of future eclipses d. keep the dates of solstices and equinoxes about the same from year to year
The paths of fragments of fireworks are
A) normally straight lines. B) parabolas. C) different from the paths of projectiles.
Can an element decay "forward" in the periodic table, to a higher atomic number?
A) No, in fact elements cannot alter their atomic number by radioactive decay. B) No, but an element can decay to a lower atomic number. C) Yes, by alpha decay. D) Yes, this can occur by means of both beta decay and alpha decay. E) Yes, by beta decay.