An uncharged pith ball is suspended by a nylon fiber. When a positively-charged rubber rod is brought nearby, the pith ball
A) moves toward the rod.
B) is unaffected.
C) moves away from the rod.
D) none of the above
Answer: A
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What is the Fermi Paradox?
A) Galactic civilizations, like ours, 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) Reasonable assumptions predict that a galactic civilization should have already arisen in the Milky Way. Yet, we have absolutely no evidence for it. D) The Drake equation predicts that there should be no intelligent life in the Milky Way. Yet, we exist. E) We would be unable to detect an Earth-like planet even at a distance of a few light years.
When a photon collides with a free electron at rest and the direction of motion of the photon changes,
a. the magnitude of the momentum of the photon does not change. b. the momentum of the electron does not change. c. the kinetic energy of the electron does not change. d. the total energy of the photon does not change. e. both the magnitude of the momentum and the total energy of the photon decrease.
The brightest active galaxies are giant ellipticals
Indicate whether the statement is true or false
A block is launched up an inclined plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3 . The speed of the block when it reaches the starting position on the trip down:
a. is the same as the launching speed. b. is less than the launching speed. c. is more than the launching speed. d. cannot be compared to the launch speed with the information given.