The optical classification of galaxies was pioneered in the 1930s by ________
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Edwin Hubble
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The Moon has a period of rotation that is ________ to its period of revolution
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What evidence suggests that most of the mass of the Milky Way is in the form of dark matter?
A) The orbital speeds of stars far from the galactic center are surprisingly high. B) Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk. C) Although dark matter emits no visible light, we have detected its radio emissions. D) Our view of distant galaxies is often obscured by dark blotches, which are presumably made of dark matter.
A physicist claims that she has found a new particle with a mass 200 000 times the mass of the proton (1.67 × 10^?27 kg) and a charge of 3.20 × 10^?19 C. If she is correct, such a particle traveling in a circle in a uniform 5.00 T magnetic field at a velocity of 2 500 m/s will have a radius of
a. 0.261 m. b. 0.522 m. c. 1.04 m. d. 3.27 m. e. 3.13 × 10^26 m.
The resistance of the heater is __________
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