Contrast the volcanism of Io and Triton
What will be an ideal response?
Both are driven by tidal flexing, but at Io, it is sulfur erupting, while Triton is much colder, with liquid nitrogen geysers.
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A 4,000 kg satellite is traveling in a circular orbit 200 km above the surface of the Earth. A 3.00 gram marble is dropped inside the satellite. What is the force of gravity on the marble as viewed by the observers on the Earth? 
A. 0.405 N B. 0.362 N C. 0.277 N D. 0.202 N E. 0.185 N
Why do researchers believe that asteroids in the asteroid belt are primal rocks that did not merge into a planet?
A) The total mass of the asteroids in the asteroid belt is much smaller than that of any terrestrial planet in our solar system. B) The differences in chemical compositions of the asteroids are too large for them to have originated in a single body. C) Jupiter's gravity could have prevented these objects merging into a single body. D) All of the above. E) None of the above.
The value of a wavelength in the Balmer series is 410.2 nm. What is the value of n?
A) 4 B) 5 C) 6 D) 7 E) 9
The inductive reactance of a 20-mH inductor at a certain frequency is 120 ?. What is the frequency in rad/s?
A) 2000 rad/s B) 4000 rad/s C) 5000 rad/s D) 6000 rad/s E) 7000 rad/s