A walker walks 30 m from the origin toward the WEST to point A. She then walks from point A, 20 m more toward the EAST to point B. The walker's total displacement form the origin is
A. 50 m toward the EAST.
B. 30 m toward the WEST.
C. 20 m toward the WEST.
D. 10 m toward the EAST.
E. 10 m toward the WEST.
E. 10 m toward the WEST.
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Which statement about young stars is FALSE?
A) They contain a larger fraction of heavy elements than previous generations. B) They are born in a dustier environment than earlier generations. C) They are more likely to have planets forming with them than earlier generations. D) The high mass stars will be more likely to produce heavier elements as they evolve. E) Being young, they will have more pure hydrogen than earlier generations.
How long have mammals been present on Earth?
A) about 1 million years B) about 65 million years C) about 225 million years D) about 510 million years
In problems involving a slope or inclined plane, the force due to gravity is always perpendicular to the slope or the plane
Indicate whether the statement is true or false
Quasar's spectral lines are:
A) emission lines with large redshifts. B) a continuum from the synchrotron radiation. C) fuzzy absorption lines from the merged light of the billions of stars. D) too complex for any interpretation. E) nonexistent, the gas so hot as to be totally ionized, so no lines are seen.