The point in Earth's orbit where Earth is farthest from the Sun is known as
a. aphelion.
b. perihelion.
c. precession.
d. the winter solstice.
e. a and d.
a
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A mega-parsec (Mpc) is equivalent to
a. 3.26 light-years. b. 206,265 light years. c. 1,000,000 light years d. 3,260,000 light-years. e. the diameter of the Milky Way galaxy.
How many types of fundamental particles exist?
A.) 6. B.) 12. C.) 24. D.) 30. E.) 300.
Life probably did not originate on the land surface because
A) impacts would have destroyed any life that appeared B) water was not plentiful on land C) there was no ozone layer to shield out harmful UV rays D) organic materials were not present on the land
Particles (mass of each = 0.20 kg) are placed at the 40-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the initial angular acceleration of the body?
A. 12 rad/s2 B. 5.9 rad/s2 C. 8.4 rad/s2 D. 5.4 rad/s2 E. 17 rad/s2