If the acceleration vector of an object is directed perpendicular to the velocity vector,
A) the object is turning.
B) the object is speeding up.
C) the object is slowing down.
D) the object is not moving.
E) this situation would not be physically possible.
A
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Mathematical models indicate that ____ galaxies are produced by high speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy
a. ring b. spiral c. antenna d. irregular e. tidal tail
What did the Greek philosopher Philolaus believe about the Universe? a. No parallax seen of new stars means Earth is the center of the Universe. b. Perfect heavens must be made of up spheres rotating at constant rates. c. The most perfect geometrical form was the sphere
d. The heavens are perfect and Earth is imperfect. e. Earth moved around a central fire.
Tom is going to your left at 90% of the speed of light and Joan is going to your right at 90% of the speed of light. What will Tom say about you and Joan?
A) You are moving away from him at 90% the speed of light. Joan is moving away from him at 180% of the speed of light. B) You are moving away from him at 90% the speed of light. Joan is moving away from him at as speed that is faster than 90% of the speed of light, but slower than the whole speed of light. C) You are moving away from him at 90% the speed of light. Joan is moving away from him at as speed of light. D) You and Joan are both moving away from him at 90% the speed of light.
A ______________ is an ultra-hot collection of electrically charged particles
a. gas b. liquid c. plasma d. solid