Single convex spherical mirrors produce images that
A) are always smaller than the actual object.
B) are always larger than the actual object.
C) are always the same size as the actual object.
D) could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object.
E) are sometimes real.
A
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A ball is rolling along the floor. It is rolling toward the east, and slowing down as it rolls. As the ball rolls,
A) the net force on it is toward the west. B) its velocity is toward the west. C) Both of the above. D) the net force on it is zero. E) the net force on it is toward the east.
Which of the following is not the usual outcome of nuclear fission?
a. The binding energy per nucleon of the fission fragments is smaller than that of the original nucleus. b. Energy is released. c. Neutrons are released. d. The fission fragments are radioactive.
A pair of parallel conducting plates have potentials of -17 V and 55 V, respectively. An electron is ejected from the plate at potential -17 V and travels to the plate at 55 V. What is the speed of the electron as it strikes the 55 V plate, assuming it left the -17 V plate from rest? The mass of the electron is 9.11 x 
kg.
a. 
b. 
c. 
d. 
Elements heavier than hydrogen and helium constitute about ________ of the mass of the Milky Way's interstellar medium.
A) 0.002 % B) 2 % C) 70 % D) 98%