What best describes the cosmic microwave background radiation? a. existing at the 'red' end of the light spectrum. b. moving towards us rapidly. c. low energy, a few degrees above 0 kelvin d. very high energy, millions of kelvins.
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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

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec

Smallest intensity of a stimulus that you can detect 50 percent of the time is