The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system.
b. inelastic collisions between particles within the system.
c. changes of momentum of individual particles within the system.
d. internal forces acting between particles within the system.
e. external forces acting on particles of the system.
e
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What are the clouds of Uranus composed of?
a. hydrogen b. helium c. carbon dioxide d. methane e. sulfur
Melting snow tends to
A) warm the surrounding air. B) cool the surrounding air. C) neither of these
Thin Films: When a beam of light that is traveling in glass strikes an air boundary at the surface of the glass, there is
A. a 90° phase change in the reflected beam. B. no phase change in the reflected beam. C. a 180° phase change in the reflected beam. D. a 60° phase change in the reflected beam. E. a 45° phase change in the reflected beam.
If a source of light is approaching us at 3,000 km/sec, then all its waves are
A) redshifted by 1%. B) not affected, as c is constant regardless of the direction of motion. C) blueshifted out of the visible spectrum into the ultraviolet. D) blueshifted by 1%. E) redshifted out of the visible into the infrared.