Which statement about accretion disks is not true?
A) The gas in the inner parts of the disk travels faster than the gas in the outer parts of the disk.
B) The gas in the inner parts of the disk is hotter than the gas in the outer parts of the disk.
C) The primary factor determining whether a white dwarf has an accretion disk is the white dwarf's mass.
D) Accretion disks are made primarily of hydrogen and helium gas.
C
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A sprinter runs 100.0 m in 9.87 seconds. If he travels at constant acceleration for the first 75.0 m and then at constant velocity for the final 25.0 m, what was his peak velocity?
A. 17.7 m/s. B. 17.5 m/s. C. 20.3 m/s. D. 15.4 m/s.
Which of the following statements about halo stars is false?
A) Halo stars have random orbits about the Milky Way center. B) Halo stars are no longer being formed at the current epoch. C) All halo stars are less massive than our Sun. D) Halo stars are made entirely of hydrogen and helium with no heavy elements. E) Halo stars are some of the oldest known objects in the universe.
The Pacific Ocean southwest of the United States is the source region for the ______________ type of air mass
a. cP b. mA c. mT d. mP
An electric generating plant produces 400 MW of electric power while operating at 40% efficiency. The rate at which this plant consumes energy [in the form of the thermal energy obtained by burning the coal that is fed into the plant] is
A) 160 MW. B) 600 MW. C) 240 MW. D) 1000 MW. E) 1400 MW.