Uranus and Neptune appear blue or blue-green because
a. their atmospheres absorb blue light very efficiently.
b. their solid air-less surfaces are this color
c. their surfaces are covered with liquid water with no atmosphere
d. traces of methane in their atmospheres absorb red light very efficiently.
D
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Angular Momentum: A puck moves on a horizontal air table. It is attached to a string that passes through a hole in the center of the table. As the puck rotates about the hole, the string is pulled downward very slowly and shortens the radius of rotation, so the puck gradually spirals in towards the center. By what factor will the puck's angular speed have changed when the string's length has decreased to one-half of its original length?
A. 2
B. 4
C. 
D. 1
E. 1/2
Suppose a solid uniform sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The angular velocity of the sphere at the bottom of the incline depends on
A) the mass of the sphere.
B) the radius of the sphere.
C) both the mass and the radius of the sphere.
D) neither the mass nor the radius of the sphere.
A quantum number for a quark is
a. strangeness. b. beauty. c. charm. d. truth. e. all of the above.
Consider methods to identify the major polluters from among the many cars on the road (a few are responsible for most of the pollution). List as many as you can and explain how they can help reduce the problem
How many of these do you know are being used in your state?