As a given thundercloud's base elevation gets lower and lower, the possibility of lightning strike
A. is less, since the electric field gets weaker.
B. is greater, because the electric field strength increases.
C. is unchanged, because the thundercloud has not polarized.
Answer: B
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A shell explodes into two fragments, one fragment 25 times heavier than the other. If any gas from the explosion has negligible mass, then
A) the momentum change of the lighter fragment is exactly the same as the momentum change of the heavier fragment. B) the momentum change of the heavier fragment is 25 times as great as the momentum change of the lighter fragment. C) the momentum change of the lighter fragment is 25 times as great as the momentum change of the heavier fragment. D) the kinetic energy change of the heavier fragment is 25 times as great as the kinetic energy change of the lighter fragment. E) the kinetic energy change of the lighter fragment is 25 times as great as the kinetic energy change of the heavier fragment.
What is the self-inductance in a coil that experiences a 3.0-V induced emf when the current is changing at a rate of 37 A/s?
a. 81 mH c. 27 mH b. 37 mH d. 45 mH
Light travels from inside a building to outside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. A 180o phase change occurs at the inside surface but not at the outside surface. b. A 180o phase change occurs at the outside surface but not at the inside surface. c. A 180o phase change occurs at both the inside surface and the outside surface. d. No phase change occurs at either the inside surface or the outside surface of the glass.