Astronomers are comparing two stars that are known to have the
same luminosity. Star A is observed to be 4 times brighter than star B.
How far away is Star A compared to Star B?
2 times closer
4 times closer
2 times farther
16 times closer

Which instrument is used to measure air temperature

Although light from the sun appears white, it is actually made up of a lot of different colors. this portion of the electromagnetic spectrum, we call white light is referred to as within the electromagnetic spectrum.

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f