If the average speed of a particle is greater than 0 m/s over some interval of time, which of the following is true?
1.The instantaneous speed of the particle at some time during the interval could never have been greater than 0 m/s.
2.The instantaneous speed of the particle at some time during the interval must have been equal to 0 m/s.
3.The instantaneous speed of the particle at some time during the interval must have been greater than 0 m/s.
4.The instantaneous speed of the particle at some time during the interval could never have been less than 0 m/s.
3
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Parallel-Plate Capacitor: An ideal air-filled parallel-plate capacitor consists of two circular plates, each of radius 0.30 mm. How far apart should the plates be for the capacitance to be 300.0-pF? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 0.0083 ?m B. 0.0042 ?m C. 0.00094 ?m D. 0.00047 ?m
What would you expect to be different in a planetary system in which the nebular gas is blown into interstellar space by a stellar wind earlier than occurred in our solar system?
A) No terrestrial planets would form. B) Jovian planets would be less massive because they had less time to gather hydrogen and helium gas. C) All planets would be more massive than Jupiter. D) Most of the planets would be destroyed by migration onto the central star.
The first time period for which abundant fossils have been found is the
A) Precambrian. B) Silurian. C) Pliocene. D) Cambrian.
A negatively-charged particle is slowly moving as it enters a region that has a constant magnetic field. If the velocity of the particle is initially parallel to the magnetic field, what will be the subsequent motion of the particle?
a) It will follow a helical path around the magnetic field lines. b) It will follow a circular path in the plane perpendicular to the magnetic field lines. c) It will follow a straight line path in the same direction as it was initially traveling. d) It will follow a circular path in a plane parallel to the magnetic field lines. e) It is impossible to predict the path the particle will follow.