A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.0 
then the angular velocity of the CD after 3.0 sec is
A. 12 rad/s.
B. 10 rad/s.
C. 9.0 rad/s.
D. 8.0 rad/s.
E. 6.0 rad/s.
E. 6.0 rad/s.
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Which of the following best describes the origin of ocean tides on Earth?
A) Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of the earth. B) The Moon's gravity pulls harder on water than on land, because water is less dense than rock. C) Tides are caused by the 23 1/2° tilt of the earth's rotational axis to the ecliptic plane. D) Tides are caused primarily by the gravitational force of the Sun. E) Tides are caused on the side of Earth nearest the Moon because the Moon's gravity attracts the water.
Significant Figures: A dog has three puppies. Spot weighs 12 ounces. Rascal weighs 9.5 ounces. Socks weighs 10.2 ounces. What is the total weight of the litter expressed to the correct number of significant figures?
A. 31.7 ounces B. 31 ounces C. 32 ounces D. 30 ounces E. 31.70 ounces
Why is the core hot?
A. from both the decay of radioactive atoms and the leftover heat B. from heat left over from the planet's birth C. The high pressure in the core drives the temperature higher. D. from the steady decay of radioactive atoms in the rock E. None of these choices are correct.
Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be protected from freezing by having in the room
A) blocks of foam plastic. B) large tubs of water. C) an ample supply of fire wood. D) none of the above