Which of the following statements about degeneracy pressure is not true?
A) Degeneracy pressure keeps any protostar less than 0.08 solar mass from becoming a true, hydrogen-fusing star.
B) Degeneracy pressure can halt gravitational contraction of a star even when no fusion is occurring in the core.
C) Degeneracy pressure is a consequence of the laws of quantum mechanics.
D) Degeneracy pressure varies with the temperature of the star.
D
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If the Q value of an endothermic reaction is –2.17 MeV, then the minimum kinetic energy needed in the reactant nuclei if the reaction is to occur must be
1.equal to 2.17 MeV. 2.greater than 2.17 MeV. 3.less than 2.17 MeV. 4.exactly half of 2.17 MeV.
Galileo was the first to observe the phases of ________.
A. Venus B. Earth C. the moon D. the sun
A car travels around an oval racetrack at constant speed. The car is accelerating
A. at all points except B and D. B. at all points except A and C. C. at all points except A, B, C, and D. D. everywhere, including points A, B, C, and D. E. nowhere, because it is traveling at constant speed.
Linear momentum is conserved in all collisions
a. True b. False Indicate whether the statement is true or false