The buildup of thermal energy in a collapsing gas cloud leads to thermal pressure that can halt the gravitational collapse. What must happen for the gravitational collapse to continue?
A) The cloud must radiate away some of its thermal energy.
B) The cloud must gain mass.
C) The cloud must have a very strong magnetic field.
D) The cloud must get a push from the radiation of nearby hot, young stars.
A) The cloud must radiate away some of its thermal energy.
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The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. These data were obtained by measuring
A) the precise wavelengths of spectral lines in the spectrum of the star. B) the precise wavelengths of spectral lines in the spectrum of the orbiting planet. C) the precise brightness of the star divided by the precise brightness of the planet. D) the orbital period of the planet that is orbiting the star.
According to the theory of relativity, the speed of light is absolute (meaning that everyone always measures it to have the same value)
Indicate whether the statement is true or false
In producing a uranium bomb, the most difficult step is
A) getting the uranium into gaseous form B) finding and mining the uranium. C) separating the fissionable isotope from the non-fissionable isotope. D) constructing the triggering mechanism. E) keeping it from blowing up during construction.
Resonance occurs when a 200-Hz tuning fork encounters a sound wave with a frequency of
A) 150 Hz. B) 200 Hz. C) 300 Hz. D) any of the above E) none of the above