What normally occurs in a saucer of water placed on your table is
A) evaporation.
B) condensation.
C) both of these
D) none of the above
Answer: C
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Which of the following statements is true of the evolution of massive stars?
A) Once the gas in the core of a massive star has been converted to iron, there are no further nuclear reactions that can release energy. B) Once helium fusion has occurred, the core of the massive star will never get hot enough to fuse any additional elements. C) Silicon fusion produces neon, the most tightly bound of all atomic nuclei, which inhibits the release of energy after a nuclear fusion. D) The most massive blue giant stars can fuse elements heavier than iron in their cores.
An ideal gas is kept in a rigid container that expands negligibly when heated. The gas starts at a temperature of 20.0°C, and heat is added to increase its temperature
At what temperature will its root-mean-square speed (thermal speed) be double its value at 20.0°C? A) 40.0°C B) 141°C C) 313°C D) 400°C E) 899°C
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.
A cubical gaussian surface is bisected by a large sheet of charge, parallel to its top and bottom faces. No other charges are nearby. Through how many of the cube’s faces is the electric flux zero?
1.0 2.2 3.4 4.6