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
d
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Why is the ozone layer in Earth's atmosphere important to life on its surface?
What will be an ideal response?
Standing Waves on a String: Standing waves of frequency 17 Hz are produced on a string that has a mass per unit length of 0.0160 kg/m. To what tension must the string be stretched between two supports if adjacent nodes in the standing wave are to be 0.87 m apart?
Fill in the blank(s) with the appropriate word(s).
A mass of 0.40 kg, attached to a spring with a spring constant of 80 N/m, is set into simple harmonic motion. What is the magnitude of the acceleration of the mass when at its maximum displacement of 0.050 m from the equilibrium position?
a. zero c. 10 m/s2 b. 5 m/s2 d. 20 m/s2
Eternal Inflation refers to
A) the possibility that our universe is only a patch of a greater universe and that the process of universe spawning will continue forever. B) the observation that cosmic inflation could eventually curve back in on itself, causing its opposite: the compression of space. C) cosmic inflation inflating itself such that its own inflation is self-generating. D) the presence of a distinct beginning of time.