Which of the Galilean moons has volcanic activity?
a. Io
b. Europa
c. Ganymede
d. Callisto
a
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When 4 V of potential difference is applied across Resistor A, 2 A of current flows through it. When 4 V of potential difference is applied across Resistor B, 1 A of current flows through it. When 12 V is applied across Resistor A, 6 A flows through it, and when 12 V is applied across Resistor B, 3 A flows through it. Which of the following is consistent with this data?
1.Both resistors are not ohmic. 2.Resistor A is ohmic but Resistor B is not. 3.Resistor A is not ohmic but Resistor B is. 4.Both resistors are ohmic.
A Michelson interferometer is used to measure the thickness of a thin film with light of wavelength 560 nm. If the introduction of the film into one of the arms of the interferometer causes a change in the interference pattern by exactly 79 bright fringes, what is the thickness of the film? The film’s index of refraction is 1.39.
A. 56.0 microns B. 113 microns C. 56.7 microns D. 112 microns E. 15.9 microns F. 15.7 microns
An annular eclipse
A. occurs when the Moon's shadow does not completely reach Earth during a solar eclipse. B. occurs when Earth's shadow does not completely reach the Moon during a lunar eclipse. C. is a lunar eclipse that happens every November. D. is a solar eclipse that happens every November.
At Titan, the lakes are made mostly of liquid
A) metallic hydrogen. B) nitrogen. C) carbon dioxide. D) methane. E) water.