Warm humid air is characteristic of a
A) maritime polar air mass.
B) continental polar air mass.
C) maritime tropical air mass.
D) continental tropical air mass.
Answer: C
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What is the role of collisions between galaxies in the formation and evolution of galaxies?
A) in a collision both galaxies are always destroyed so galaxy formation must be an ongoing process B) galaxies are moving very fast and when they collide they always just move right through each other, never to interact again C) larger galaxies may have formed from the merger of smaller ones D) galaxies are much too far apart to ever have collisions E) in a collision all the stars in the galaxies are spread out and then must find other stars and come together and form new galaxies
A stepped steel shaft (G 5 75 GPa) with diameters d1 5 36 mm and d2 5 32 mm is twisted by torques T at each end. Segment lengths are L1 5 0.9 m and L2 5 0.75 m. If the allowable shear stress is 28 MPa and maximum allowable twist is 1.88, the maximum permissible torque is approximately:
(A) 142 N?m
(B) 180 N?m
(C) 185 N?m
(D) 257 N?m
What percentage of the solar nebula's mass consisted of hydrogen and helium gases?
A) 0.5 percent B) 5 percent C) 50 percent D) 98 percent E) 100 percent
A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.1 cm cos(2000 rad/s t - 40
x). What is the direction of the velocity of the wave?
A. the - x direction B. the + x direction C. the - y direction D. the + y direction