For stars in the main sequence, which color of stars tend to have higher absolute brightness? white stars yellow stars blue stars red stars what type of star has an absolute brightness of −3 and a surface temperature around 20,000 °c? supergiant giant main sequence dwarf

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.