A component in an automobile 12-V electrical system has a resistance of 20 ?
a. How much current is in the component when the system is in operation?
b. How much energy is dissipated by the component each second?
a. 0.60 A
b. 7.2 J
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Suppose that you were selected for a "Survivor"-type TV show. To help keep your group connected, you suggest that long vines can be tied together and used to transmit signals in cases of emergency. To get the signals to travel faster, you should
a. select lighter vines. b. increase the tension on the vines. c. hang weights from the vines at evenly spaced intervals. d. do all of the above. e. do (a) or (b) above, preferably both.
The ancient Greeks noted that the planets
A) kept step with the stars. B) were a reddish color. C) wandered around among the stars. D) moved in ellipses around the sun. E) Nonsense--the Greeks didn't know anything about the planets.
What did Rutherford's famous scattering experiment help to prove in his day?
When was the existence of the neutron confirmed?
a. in ancient times b. in 1895 c. in 1932 d. in 1969