How do we calculate or determine the distances to stars? What units do we use and what are the limitations (if any) of the method used for such calculations?
What will be an ideal response?
The method of measuring distance to stars beyond 100 light-years is to use Cepheid variable stars. These stars change in brightness over time, which allows astronomers to figure out the true brightness. Comparing the apparent brightness of the star to the true brightness allows the astronomer to calculate the distance to the star.
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Impulse involves the time that a force acts. Work involves the
A. time and distance that a force acts. B. distance that a force acts. C. acceleration that a force produces. D. none of the above
A heavy stone is launched straight upward at 100 m/s. If air resistance can be neglected, the time to reach its maximum height is
A. more than 20 s. B. 10 s. C. 20 s. D. none of the above
Generally speaking, a spill of crude oil is more dangerous to marine life than a spill of refined oil
Indicate whether the statement is true or false
A crude birth rate that is rapidly declining is typical of a country in which stage of the demographic transition?
A) Stage 1 B) Stage 2 C) Stage 3 D) Stage 4 E) Stages 2 and 3