Which of the following words best describes the sum total of all matter and energy that exists?
A) supercluster
B) universe
C) multiverse
D) macrocosm
B
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Suppose you electrically charge a transparency by rubbing it, and then hang the transparency, at rest, by a string in the center of a room. Except for the transparency and string, the room is totally evacuated of all matter
Neglecting any influences from outside the room, what kinds of fields would then be found at places inside the room but away from the transparency--for instance, at a point near a corner of the room? A) an electric field only B) a magnetic field only C) Both an electric and magnetic field D) No fields at all, because the transparency would create electromagnetic fields only within the transparency itself E) No fields at all, because there is nothing [no material object] at such a point
An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/
A) A) 0.0063 T B) 0.20 T C) 3.2 T D) 4.8 T E) 0.31 T
The principal landform resulting from a stream's erosive power is its ______________-shaped valley
Fill in the blank(s) with correct word
The energy of an electron state has an uncertainty of about 0.500 eV. What is the uncertainty in the lifetime of the level?
A) 1.32 × 10-15 s B) 8.28 × 10-15 s C) 1.32 × 10-11 s D) 8.28 × 10-11 s E) 1.32 × 10-8 s