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FIGURE 2
Apparent and Absolute Brightness
The three stars Alnitak, Alnilam, and
Mintaka in the constellation Orion all
seem to have the same apparent bright-
ness from Earth. But Alnilam is actually
farther away than the other two stars.
CHALLENGE Which star has the
greatest absolute brightness? How do
you know?
30 points

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Disney, viacom and aol time warner are examples of

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents