Objects the size of the one that exploded over Chelyabinsk (Russia), causing significant damage and injuries to more than 1,000 people, probably hit Earth at least
A) once a century.
B) once a year.
C) once every 500,000 years.
D) once every 100 million years.
A) once a century.
You might also like to view...
What kinds of atomic nuclei formed during the nucleosynthesis era?
A) only hydrogen B) essentially all of the chemical elements, except for those heavier than uranium C) roughly equal amounts of hydrogen, helium, lithium, beryllium, and boron D) only helium E) hydrogen, helium and trace amounts of lithium, beryllium, and boron
A particular motor can provide a maximum torque of 110 N ? m. Assuming that all of this torque is used to accelerate a solid, uniform, cylindrical flywheel of mass 10.0 kg and radius 3
00 m, how long will it take for the flywheel to accelerate from rest to A) 3.33 s B) 2.83 s C) 4.03 s D) 4.36 s
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
Saturn's rings may have been formed when a small moon or icy planetesimal came within Saturn's _______________ and tides pulled it apart
Fill in the blank(s) with correct word