The figures below represent interference fringes. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. In each figure the spacing d between the slits is the same. Which figure(s) represent(s) slits illuminated with light of the greatest wavelength ?? The white spaces represent the interference maxima
a.
I.
b.
II.
c.
III.
d.
IV.
e.
V.
e
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Jacques and George meet in the middle of a lake while paddling in their canoes. They come to a complete stop and talk for a while. When they are ready to leave, Jacques pushes George's canoe with a force to separate the two canoes
What is correct to say about the final momentum and kinetic energy of the system if we can neglect any resistance due to the water? A) The final momentum is in the direction of but the final kinetic energy is zero. B) The final momentum is in the direction opposite of but the final kinetic energy is zero. C) The final momentum is in the direction of and the final kinetic energy is positive. D) The final momentum is zero and the final kinetic energy is zero. E) The final momentum is zero but the final kinetic energy is positive.
Which of the following is not an exception to the general patterns of motion in the solar system?
A) the "backward" orbit of Triton around Neptune B) the extreme axis tilt of Uranus C) the counterclockwise rotation of Venus D) the large size of Earth's moon E) the rings of Saturn
"Firewalkers" step on the hot ashes and coals from a wood fire without getting their feet burned. How might this be possible?
a. They have magical powers. b. The ashes are poor conductors of heat. c. They do get burned but enjoy the publicity. d. none of the above
Global warming
a. has not yet been observed. b. has been caused by increasing levels of carbon dioxide in the atmosphere. c. has led to a depletion of the ozone layer in the atmosphere. d. has no serious consequences.