A normal neutron star is spun up to a millisecond pulsar by accretion of matter from a ________ binary companion
Fill in the blank(s) with correct word
mass transfer
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Repeatedly dipping your fingers into water produces waves. Increasing the frequency of dipping produces waves that are
A) shorter. B) longer. C) the same.
Of the first exoplanets found, most 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.
The central engine for active galaxies is believed to be a(n) ________
Fill in the blank(s) with correct word
A cube of water ice (? = 0.917 × 103 kg/m3) is placed in mercury (? = 13.6 × 103 kg/m3), which is liquid at 0° Celsius. If we ignore any possible melting of the ice cube and problems with the surface tension of mercury, the fraction of the ice cube that floats above the surface of the mercury is
A. 0.067 4. B. 0.073 5. C. 0.926. D. 0.933. E. 1.00.