A component in an automobile 12-V electrical system has a resistance of 20 ?. How much energy is dissipated by the component each second?
a. 0.14 J
b. 7.2 J
c. 1.7 J
d. 0.6 J
b
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You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0 × 10-18 J. What should be the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 0.11 nm B) 0.22 nm C) 0.15 nm D) 0.18 nm
State Kepler's second law
What will be an ideal response?
You travel 2640 feet in thirty seconds while in a 65 mi/hr zone. (There are 5280 ft in one mi.) Your average speed is
A. less than the speed limit. B. larger than the speed limit. C. exactly the speed limit.
Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A) It is doubled. B) It stays the same. C) It is tripled. D) It is quadrupled. E) It is reduced by a factor of two.