Which of the following provides important evidence for the existence of dark matter in clusters of galaxies?
A) careful counts of the numbers of galaxies in clusters
B) the relative proportions of spiral and elliptical galaxies in clusters
C) the high temperature and distribution of gas between the galaxies in clusters
D) the total luminosity in visible light coming from cluster galaxies
C) the high temperature and distribution of gas between the galaxies in clusters
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Relative to a fossil-fuel plant, a nuclear power plant produces
A) more electricity. B) less heat and smoke. C) less pollution. D) all of the above E) none of the above
A sample of blood is placed into a centrifuge of radius 15.0 cm. The mass of a red corpuscle is 3.0 × 10^?16 kg, and the centripetal force required to make it settle out of the plasma is 4.0 × 10^?11 N. At how many revolutions per second should the centrifuge be operated?
The energy differences in some of the rotational energy levels of the water molecule allow cooking with ______________
Fill in the blank(s) with correct word
The sedimentary rock known as ______________ consists of deposits of calcium carbonate (calcite)
a. coal b. sandstone c. limestone d. lodestone