In order of visual luminosity at the start, which is most luminous?
A) a red supergiant
B) a planetary nebula
C) a nova
D) a type I supernova
E) a type II supernova
D
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According to Einstein’s theory of special relativity, a stationary observer measures
A. a shorter length of an object than a moving observer measures B. a longer length of an object than a moving observer measures C. the same length of an object than a moving observer measures
The electric field is continuous
Indicate whether the statement is true or false
Weight and g: An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A. zero. B. the same as on the surface of the earth. C. one-half of its weight on the surface of the earth. D. one-third of its weight on the surface of the earth. E. one-quarter of its weight on the surface of the earth.
The satellite Amalthea orbits Jupiter at just about the same distance in kilometers at which Mimas orbits Saturn. Yet Mimas takes almost twice as long to orbit
What can you deduce from this difference qualitatively? Since Jupiter and Saturn are not very different in radius, what else can you conclude?