A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg?m2. If the arms are pulled in so the moment of inertia decreases to 1.80 kg?m2, what is the final angular speed?
A) 2.25 rad/s
B) 4.60 rad/s
C) 6.25 rad/s
D) 1.76 rad/s
E) 0.81 rad/s
C
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Each box in this figure represents a different level of structure in our universe. Each box is labeled with one of the numbers 1—5. Which box represents the Milky Way Galaxy?
A) 1 B) 2 C) 3 D) 4 E) 5
Photons of wavelength ? scatter elastically from protons at rest. The wavelength of photons scattered at 90° is increased by:
1.?/137 2.h/2?c 3.h/(mec) 4.h/(mpc) 5.? cos(45°) 6.None of the above
A galaxy that has gone through many collisions and mergers must be a(n) _______________ galaxy
Fill in the blank(s) with correct word
The early atmosphere of Earth had more methane and ammonia than what is present today. Where did these gases go?
A. Methane and ammonia dissolved in Earth's oceans. B. Sunlight broke methane and ammonia apart and the hydrogen escaped to space. C. Plant life converted methane and ammonia to nitrogen and carbon through photosynthesis. D. Cometary and planetesimal impacts provided enough energy for these gases to escape to space.