In a perfectly ELASTIC collision between two perfectly rigid objects
A) the momentum of each object is conserved.
B) the kinetic energy of each object is conserved.
C) the momentum of the system is conserved but the kinetic energy of the system is not conserved.
D) both the momentum and the kinetic energy of the system are conserved.
E) the kinetic energy of the system is conserved, but the momentum of the system is not conserved.
Answer: D
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A box is sliding down an incline tilted at an angle 14.0° above horizontal. The box is sliding down the incline at a speed of 1.70 m/s. The coefficient of kinetic friction between the box and the incline is 0.380
How far does the box slide down the incline before coming to rest? A) 1.16 m B) 2.33 m C) 1.78 m D) 0.720 m E) The box does not stop. It accelerates down the plane.
One hypothesis suggested to explain the uniform age of the surface of Venus is that
a. Venus' surface is 4 billion years old and has not been affected by flooding or slow evolution. b. Venus' surface is made of rocks that are much harder than Earth's and thus last longer. c. Venus periodically goes through a catastrophic melting of the entire surface. d. Venus' clouds protect it from meteorites so that very few impacts occur to change its surface. e. dust storms deposit large amount of dust on the surface making it appear of uniform age.
When light passes through a transparent material, different wavelengths (colors) of light are refracted by differing amounts. This effect is called ________.
A. reflection B. scintillation C. dispersion D. diffraction E. aberration
You discover a binary star system in which one member is a 15 solar mass main-sequence star and the other star is a 10 solar mass giant star. Why should you be surprised, at least at first?
A) The two stars should be the same age, so the more massive one should have become a giant first. B) The two stars in a binary system should both be at the same point in stellar evolution; that is, they should either both be main-sequence stars or both be giants. C) It doesn't make sense to find a giant in a binary star system. D) A star with a mass of 15 solar masses is too big to be a main-sequence star. E) The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable.