Even if societies on stars in distant galaxies survive at a technological level for only 10 years, that is long enough to establish two-way communication with them
a. True
b. False
Indicate whether the statement is true or false
False
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Assume a 100-yard football field represents the 14-billion-year history of the universe with one end as the origin and the other end representing the present. The existence of human beings will extend from ____ to the present "goal line."
a. the 50-yard line b. the 5-yard line c. the one-yard line d. the one-inch line
A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a 5.0-kg object initially at rest. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive x direction. What was the initial speed of the 3.0 kg object?
a. 6.0 m/s b. 7.0 m/s c. 4.5 m/s d. 8.0 m/s e. 5.5 m/s
If intending to teach his students the constellations by season, why would an astronomy instructor be advised to always assign the stars in the current western sky at the beginning of each term?
What will be an ideal response?
The component in CFCs that is responsible for destroying ozone is
a. chlorine. b. oxygen. c. carbon. d. none of the above.