An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the magnetic field must have a component
A) towards the north.
B) towards the south.
C) upward.
D) downward.
E) towards the west.
A
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First Law of Thermodynamics: An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal (thermal) energy of the athlete?
A. -225 kJ B. -1075 kJ C. 1075 kJ D. 225 kJ E. 276 kJ
A radioactive nuclide of atomic number Z emits an electron, then the daughter nuclide emits a gamma ray. What is the atomic number of the resulting nuclide after both processes?
A) Z - 1 B) Z + 2 C) Z - 3 D) Z + 1 E) Z - 2
Discuss the crystalline structure of minerals
Which of the following statements about matter—antimatter engines is not true?
A) Matter—antimatter engines would be great in theory, but to date we have no evidence that antimatter even exists. B) Matter—antimatter reactions represent the most efficient possible reactions in terms of energy release. C) Spacecraft powered by matter—antimatter engines could probably reach speeds of more than half the speed of light. D) One of the major challenges to developing matter—antimatter engines is finding a way to store antimatter after it is produced.