Briefly explain the Fermi Paradox, namely the paradox of the question "Where are the aliens?"
What will be an ideal response?
If we survive and decide to become interstellar travelers, we are probably capable of establishing a "galactic civilization" within a few million years (a time period very short compared to the age of the galaxy). Because our solar system formed some five billion years after the galaxy formed, it therefore seems likely that other civilizations should have evolved and developed interstellar travel long ago and established a "galactic civilization" of their own. The paradox is that we have not yet had any contact with such civilizations.
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Two equal point charges Q are separated by a distance d. One of the charges is released and moves away from the other due only to the electrical force between them. When the moving charge is a distance 3d from the other charge, what is its kinetic energy?
What will be an ideal response?
Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will
A) age more than people who stay behind on Earth. B) have more fun than people who stay behind on Earth. C) age less than people who stay behind on Earth. D) never be able to make the trip within their lifetimes.
Three cars (car L, car M, and car N) are moving with the same speed and slam on their brakes. The most massive car is car L, and the least massive is car N
If the tires of all three cars have identical coefficients of kinetic friction with the road surface, for which car is the amount of work done by friction in stopping it the greatest? A) The amount of work done by friction is the same for all cars. B) Car L C) Car M D) Car N
A capacitor of capacitance C = 4 mC is discharged through a resistor of resistance R = 4 k?. How long will it take for the capacitor to lose half its initial stored energy?
A) 9.2 s B) 2.7 s C) 10.2 s D) 5.5 s E) 1.6 s