In an RC circuit, what fraction of the final energy is stored in an initially uncharged capacitor after it has been charging for 3.0 time constants?
a. 0.84
b. 0.90
c. 0.75
d. 0.60
e. 0.03
B
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Jane swims the length of a 40. meter pool in 10. seconds and immediately swims back to the starting position in another 15. seconds. What was her average velocity?
What will be an ideal response?
In the context of the double-slit experiment, quantum nonlocality refers to
A) the fact that the entire matter field or EM field instantaneously collapses to the single interaction point when the field interacts with the screen. B) our inability to precisely predict the point at which a spread-out matter field or EM field will interact with the screen. C) the fact that each interaction with the screen occurs over a broad area of the screen. D) the fact that the electron beam or light beam goes through both slits rather than only one. E) the fact that the particles of matter or radiation are instantaneously replaced by a spread-out matter field or EM field when the particles impact the screen.
A conducting sphere contains positive charge distributed uniformly over its surface. Which statements about the potential due to this sphere are true? All potentials are measured relative to infinity. (There may be more than one correct choice.)
A) The potential is lowest, but not zero, at the center of the sphere. B) The potential at the center of the sphere is zero. C) The potential at the center of the sphere is the same as the potential at the surface. D) The potential at the surface is higher than the potential at the center. E) The potential at the center is the same as the potential at infinity.
Half-frozen fruit punch is always sweeter than the same fruit punch completely melted because
A) the sugar sinks to the bottom. B) crystallization is a purifying process. C) the half-frozen fruit punch is warmer. D) sugar molecules are less soluble in a half-frozen solution.