What is the minimum distance of two points on the moon that can be just resolved by the Keck 10. meter telescope in Hawaii (use a wavelength of 600. nm, lunar distance of 380. thousand Km):
(a) if there were no atmosphere?
(b) if the atmosphere limits resolution to 0.2 arc-sec?
(a) 28. meters
(b) 0.4 Km
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Lobate scarps are believed to have formed on Mercury when its interior cooled and shrank
a. True b. False Indicate whether the statement is true or false
Graphical Interpretation of Work: The resultant force on an object over a 0.50-s time interval is plotted in the graph in the figure. How much work did this force do on the object during the 0.50-s interval?
A. -25 J B. 50 J C. 22 J D. 12.5 J E. 0 J
Which graph shows an object moving with a constant non-zero velocity?
GRAPH A
GRAPH B
GRAPH C
Most of first extrasolar planets found were detected by
A) noting the drop in the star's light as the planet transits its disk. B) imaging them with the HST in the infrared, where they are easier to stop. C) noting the Doppler shifts of the star as the planet orbits it from side to side. D) receiving radio transmissions from them, much like Jupiter emits. E) detecting the oxygen in their atmospheres spectroscopically.