How many 2d electron states can an atom have?
A) 8 B) 0 C) 4 D) 10 E) 6
B
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An ac generator consists of 100 loops of wire, each of area 0.090 m2, and has a total resistance 12 ?. The loops rotate about a diameter in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second
Find the maximum induced emf in the generator. A) 1.7 kV B) 0.27 kV C) 0.54 kV D) 3.4 kV
"Catastrophes" are NOT needed to explain:
A) the exceptionally large nickel-iron core of Mercury. B) the asteroid belt. C) our Moon. D) the tilt of Uranus. E) the appearance of Miranda's surface.
A straight wire carries a 12-A current eastward and a second straight wire carries a 14-A current westward. The wires are separated by a distance of 42 cm. The force per unit length on the wire carrying 12 A is
A) 8.0 × 10-5 N/m. B) 5.1 × 10-7 N/m. C) 5.1 × 10-4 N/m. D) 5.1 × 10-6 N/m. E) 8.0 × 10-7 N/m.
For an atom to be neutral, it must have the same number of:
a. electrons and neutrons b. electrons and protons c. neutrons and protons d. neutrons only e. electrons, neutrons, and protons