The potential differences around a loop ABCA in a circuit (starting at A and going back to 
A. 16 V
B. 4.0 V
C. -4.0 V
D. -16 V
E. -12 V
D. -16 V
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Molecular clouds can be observed
a. using infrared telescopes to detect ionized gas in the clouds. b. using x-ray telescope to observe the x-ray radiation from the molecules in the cloud. c. using radio telescopes to observe the CO emission from the clouds. d. by looking for blue wispy regions near star clusters. e. by looking for the 21-cm radiation from hydrogen.
The pressure relief valve is opened on a thin-walled cylindrical tank, with the radius-to-wall thickness ratio of 128, thereby decreasing the longitudinal strain by 150 3 1026. Assume E 5 73 GPa and ? 5 0.33. The original internal pressure in the tank was approximately:
(A) 370 kPa
(B) 450 kPa
(C) 500 kPa
(D) 590 kPa
The atmospheric carbon dioxide concentration
A) is higher than it has been at any time during the last 800,000 years B) is higher than it has been at any time during the Earth's history C) has remained roughly constant during the last 800,000 years D) is lower than it has been at any time during the last 800,000 years
The totally eclipsed Moon glows coppery red because sunlight reaches the Moon's surface after passing through Earth's atmosphere
a. True b. False Indicate whether the statement is true or false