A 2.00 kg piece of lead at 40.0°C is placed in a very large quantity of water at 10.0°C, and thermal equilibrium is eventually reached. Calculate the TOTAL change in entropy that occurs during this process
The specific heat of lead is 130 J/(kg?K).
A) 6.6 J/K B) 190 J/K C) 1.4 J/K D) 100 J/K E) 6.2 J/K
C
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The twinkling of stars is a result of atmospheric
A) reflection. B) refraction. C) scattering. D) dispersion. E) aberrations.
When astronomers use Hubble's law to measure the distance to a galaxy they have to measure the ________ of the galaxy.
A. mass B. recessional speed C. rotational speed D. luminosity
The largest known black holes:
A) create the dark nebulae in the plane of the Milky Way. B) can be no more than 1.4 solar masses, according to Chandrasekhar. C) lie in the cores of the most massive galaxies. D) can be no bigger than a small city, just like neutron stars. E) can be no bigger than the Earth, like white dwarfs.
Estimate the speed of a galaxy that is 10 billion light-years away
A) 0.1c B) 0.3c C) 0.5c D) 0.7c E) 0.9c