Which of the following best describes Fermi's Paradox?
A) Galactic civilizations seem forbidden by the laws of physics.
B) Interstellar travel is possible yet would take an infinite amount of time because of relativistic time dilation.
C) We would be unable to detect an Earthlike planet even at a distance of a few light-years.
D) Reasonable assumptions predict that a galactic civilization should have already arisen in the Milky Way, yet we have absolutely no evidence for it.
E) The Drake equation predicts that there should be no intelligent life in the Milky Way, yet we exist.
D) Reasonable assumptions predict that a galactic civilization should have already arisen in the Milky Way, yet we have absolutely no evidence for it.
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Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southward at an unchanging speed of 4 m/s. Are Velma and Mort in relative motion?
A) No, because they both have the same speed. B) No, because they both have the same velocity. C) No, because neither Mort nor Velma is accelerated. D) Yes, because they have different velocities. E) Yes, because they have different speeds.
A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?
A) the force on A B) the force on B C) both forces are the same.
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 25.0° with a speed of 30.0 m/s. The coefficient of static friction between the car and the road is 0.300
What is the force exerted by friction on the car? A) 1590 N B) 3430 N C) 7240 N D) 7820 N E) 795 N
Which layer of the atmosphere do you live in? What kinds of meteorological phenomena can be found in this layer??