After our Sun burns its supply of hydrogen, it will become a
A) white dwarf.
B) black dwarf.
C) black hole.
D) red giant.
E) blue giant.
Answer: D
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Which of the following best describes superconductors?
1.conductors that have less than half the resistivity of iron 2.conductors with essentially no resistance below a critical temperature, peculiar to each material 3.conductors which have a drop in their resistivity as their temperatures are lowered 4.Conductors are materials which are very useful in a variety of ways; hence the name "superconductor."
An ______style only affects the content within the tags in which it appears.
A. inline B. internal C. interface D. intermittent
A pinhole camera is used to photograph a 23-cm tall object at a distance of 3.0 m, the image being projected on film at a distance of 46 cm from the pinhole. What are the height and orientation of the image?
a. 3.5 cm, upright c. 12 cm, upright b. 3.5 cm, inverted d. 12 cm, inverted
According to Einstein's E=mc2 and the "field view of reality,"
A) atoms are entirely empty space--containing only fields. B) an atom's mass arises from the energy of its own fields. C) Both of the above. D) atoms are mostly empty space, and consist of very tiny indestructible material particles that are attached to the atom by means of electromagnetic and other fields. E) chocolate ice cream vanishes whenever you don't look at it.