How does an accretion disk around a neutron star differ from an accretion disk around a white dwarf?
A) The accretion disk around a neutron star is much hotter and emits higher-energy radiation.
B) The accretion disk around a neutron star is made mostly of helium, while the accretion disk around a white dwarf is made mostly of hydrogen.
C) The accretion disk around a neutron star is more likely to give birth to planets.
D) The accretion disk around a neutron star always contains much more mass.
A) The accretion disk around a neutron star is much hotter and emits higher-energy radiation.
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Suppose you have a spool of thread that can rotate around a fixed axis as you pull thread off it. If you pull the thread with your hand so that the thread always lies along a certain fixed line, how will your hand’s speed as it moves compare to 
, where R is the spool’s radius and 
is angular speed?
A. The hand’s speed will be greater than 
.
B. The hand’s speed will be less than .
C. The hand’s speed will be equal to .
D. The hand’s speed has nothing to do with .
Radio waves, visible light, and X-rays are all types of electromagnetic radiation
Indicate whether the statement is true or false
________ looked very bland in Voyager 2 photos in 1986, but as equinox approached in the 1990s, its disk showed belts, zones, and storms
Fill in the blank(s) with correct word
Suppose you are throwing two dice in a friendly game of craps. For any given
throw, the two numbers that are face up can have a sum of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12. Which outcome is least probable?
1.2 2.2 and 12 3.7 4.6 and 10 5.11