A spherical mirror has a radius of curvature of 22 cm. If the mirror is convex, its focal length is
A) -11 cm.
B) -44 cm.
C) 22 cm.
D) 11 cm.
E) -22 cm.
A
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Silver contains 
conduction electrons per m3. How many conduction electrons are in a 1.0 m length of silver wire of diameter 2.6 mm?
a. 
b. 
c. 
d. 
e. 
The scarps on Mercury are extremely similar to the cratered lunar highlands in appearance
Indicate whether the statement is true or false
Cometary dust tails lag behind the bluish ion tails as the comet rounds the Sun
Indicate whether the statement is true or false
Energy is released during a nuclear reaction due to a conversion between mass and energy. Mass is not conserved. The initial and final amounts are different. If a total of 1.0 gram of mass is "missing", how much energy has been released?
A. 9.0 × 1011 J B. 9.0 × 1017 J C. 9.0 × 1015 J D. 9.0 × 1013 J E. 9.0 × 1016 J