Why do some scientists say that the Moon may have been important for the evolution of life on the Earth?
A) Meteorites from the Moon brought microscopic life to the Earth.
B) It stabilized the earth's axis tilt, preventing large climate changes.
C) It created the ocean tides, and life most likely started in tide pools.
D) It shielded the Earth during the heavy-bombardment phase of the early solar system.
E) There is no known connection between the Moon and the evolution of life on the Earth.
B
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Planetary nebulae are sites of planet formation
Indicate whether the statement is true or false
Which of the following explains why the stars visible in our sky just after sunset are different from those visible just before sunrise?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
At time A, is the expansion of the universe accelerating, coasting, or decelerating?
What will be an ideal response?
What is the inductive reactance of a 200 mH inductor attached to a 120 V rms 60.0 Hz source?
A. 12.0 
B. 75.4
C. 188 
D. 940
E. 24.0