The elliptical shape of the Earth's orbit varies with time and takes about ____ to complete a cycle. This is a factor in the Milankovitch theory of ice ages
a. 24 hours
b. one year
c. 26 years
d. 260 years
e. 100,000 years
e
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A 75-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 4.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.20 s, what is the magnitude of the average horizontal force by diver on the raft?
a.900 N b.450 N c.525 N d.1500 N
Large fractures in Earth's surface that are associated with the movement of lithospheric plates are called ______________
a. canyons b. trenches c. subduction zones d. faults
According to cosmic inflation theory, the distribution of galaxies we see today is a consequence of
A) the evolution of dark matter. B) quantum fluctuations in the exceedingly small early universe. C) random expansion. D) some force yet to be identified.
In the above H-R diagram, which main sequence star is bluish in color?
A. A B. B C. C D. D E. E