A car travels around an oval racetrack at constant speed. The car is accelerating
A. at all points except B and D.
B. at all points except A and C.
C. at all points except A, B, C, and D.
D. everywhere, including points A, B, C, and D.
E. nowhere, because it is traveling at constant speed.
Answer: D
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What is the work done on the gas as it expands from pressure P1 and volume V1 to pressure P2 and volume V2 along the indicated straight line?
a.
(P1 ? P2)(V1 ? V2)/2
b.
(P1 + P2)(V1 ? V2)
c.
(P1 + P2)(V1 ? V2)/2
d.
(P1 P2)(V1 + V2)
Which of the following lists the two key predictions of the Big Bang model that have been verified by observations?
A) (1) the existence of the cosmic microwave background and (2) the amount of helium relative to hydrogen in the universe B) (1) the existence of the cosmic microwave background and (2) the existence of dark matter C) (1) the existence of the cosmic microwave background and (2) the near-critical density of the universe D) (1) the predominance of matter over antimatter and (2) the near-critical density of the universe E) (1) the predominance of matter over antimatter and (2) the large-scale structure of galaxies
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. S1 and S2 are in phase. The black circles are one and two wavelengths from their respective sources. The lighter circles are one half and one and a half wavelengths distant from their respective sources. If the waves shown
arriving at P2 both arrive with amplitude A, the resultant amplitude at point P2 is
a.
0.
b.
.
c.
A.
d.
Two thin layers of material with different indices of refraction are coated on a glass plate. The outer first material has n1 = 1.404, the inner second material has n2 = 1.176, and the glass has nglass = 1.62 . If light is incident from air on the first layer, what is the phase change relative to that of the first layer reflection for light that reflects from the glass?
a. 180° c. 360° b. 540° d. 0°