What is the scientific community's view of the scientific value of astrology?
A) It is unscientific, because its practitioners do not understand the principles of physics or astronomy.
B) It is unscientific, because its predictions have been shown to be incorrect.
C) Even though its predictions are occasionally inaccurate, it does deserve to be classified as a true science.
D) It is unscientific, because it does not support its theories with clear and verifiable predictions about observations.
E) It is scientific, even though it is not related to the "real world" of observed phenomena.
D
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Collisions in Two Dimensions: An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction 60° north of east. How fast was the boy moving just before the collision?
Fill in the blank(s) with the appropriate word(s).
Hubble's law is not applicable to ________ because the motion of these galaxies is affected by ________.
A. galaxies in the Local Group; gravitational interaction with the Milky Way B. distant galaxies; intervening dust C. spiral galaxies; their spiral arms D. elliptical galaxies; their rotation
In addition to the electric force law and the magnetic force law, the other key principle that is needed to explain electromagnetic waves is
A) electromagnetic forces can be felt across a distance. B) Newton's law of motion. C) electromagnetic fields are established instantaneously. D) forces always come in pairs, so for every sender of electromagnetic force there must be a receiver. E) electromagnetic fields are not established instantaneously.
A huge explosion is heard 20 miles away. How long does it take the sound to travel that far? (20 miles = 32,000 meters)