The nucleus of a hydrogen atom, a proton, sets up an electric field. The distance between the proton and electron is about 5.1 × 10^-11 m. What is the magnitude of the electric field at this distance from the proton? [The charge on the proton is +1.6 × 10^-19 C.]
5.5 × 10^11 N/C
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Reactance: A simple ac circuit is composed of a capacitor connected across the terminals of an ac power source. If the frequency of the source is doubled, what happens to the reactance of the capacitor?
A. It increases by a factor of 4.
B. It increases by a factor of 2.
C. It increases by a factor of 
.
D. It decreases by a factor of 2.
E. It decreases by a factor of 4.
What is precession?
What will be an ideal response?
To kick a football so it won't topple end over end, kick it so the force of impact extends
A) above its center of gravity. B) through its center of gravity. C) below its center of gravity.
When comparing geologic time to a calendar year, the time of the dinosaurs is in the
A) middle of October. B) first half of December. C) second half of December. D) first half of February.