What is an accretion disk?
A) any flattened disk in space, such as the disk of the Milky Way Galaxy
B) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole
C) a stream of gas flowing from one star to its binary companion star
D) a disk of material found around every white dwarf in the Milky Way Galaxy
B
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A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.40 mm. What is the tensile modulus for this rod?
a. 
b. 
c. 
d. 
e. 
Which of the following best describes the internal layering of Jupiter, from the center outward?
A) core of rock, metal, and hydrogen compounds thick layer of metallic hydrogen layer of liquid hydrogen layer of gaseous hydrogen cloud layer B) core of rock and metal mantle of lower density rock upper layer of gaseous hydrogen cloud layer C) core of solid rock layer of solid metallic hydrogen layer of pure liquid hydrogen cloud layer D) core of liquid hydrogen compounds liquid hydrogen layer metallic hydrogen layer gaseous hydrogen layer cloud layer
A highway curve of radius 100 m, banked at an angle of 45°, may be negotiated without friction at a speed of
A) 22 m/s. B) 31 m/s. C) 44 m/s. D) 67 m/s.
MHD allows the efficiency of conventional power plants to increase
What will be an ideal response?