An astronaut in space swings a ball attached to a string in a circular motion. If the string suddenly breaks, how will the ball move?
A) It will move in a straight line in whichever direction it was moving when the string broke.
B) It will continue to move in the same circular path it had been following before the string broke.
C) It will instantly come to a stop.
D) It will move toward the astronaut.
E) It will move in a large elliptical path around the astronaut.
A) It will move in a straight line in whichever direction it was moving when the string broke.
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Active galactic nuclei were first found through observations in the ____ wavelength band
a. visible b. infrared c. X-ray d. radio e. ultraviolet
Which of the following does NOT reveal information about conditions on the early Earth?
A) the fossil record B) the sedimentary rocks found on the most ancient exposures in Greenland C) laboratory simulations of the primordial ocean and atmosphere D) advanced experiments on amino acids E) evidence gleaned from other planets in the early stages of their evolution
What do we mean by the observable universe?
A) the part of the universe that we can see with the naked eye B) the part of the universe that we can see through telescopes C) the part of the universe that could be observed in principle, including things that may require future technologies D) the compendium of all objects that we have observed to date E) the entire universe, since it is inconceivable that there could be parts of the universe that we cannot observe
Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed for a satellite about the Moon would be
A) less than 8 km/s. B) greater than 8 km/s. C) about 8 km/s.