Stars on the main sequence with the greatest mass
a. are spectral type M stars.
b. are spectral type O stars.
c. are located at the bottom of the main sequence in the HR diagram.
d. have masses very similar to the sun.
e. both b and c
B
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The region around Earth where the magnetic field traps charged particles is the
A) ozone layer. B) exosphere. C) Van Allen Radiation Belts. D) corona. E) aurora borealis and australis.
Are the Hawaiian Islands made up primarily of igneous, sedimentary, or metamorphic rock?
What will be an ideal response?
A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullet's acceleration as it passes through the board?
a. ?500 km/s2 b. ?550 km/s2 c. ?360 km/s2 d. ?520 km/s2 e. ?275 km/s2
When a star collapses to half size, the gravitational field at its surface
A) doubles. B) quadruples. C) increases eightfold. D) remains constant.