Q. Suppose 4.10 g of hydrogen is separated into electrons and protons. Suppose also the protons are placed at the earth's North Pole and the electrons are placed at the South Pole. What is the resulting compressional force on the Earth?

Q. Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. Speaker B is 2.00 to the right of speaker A. The frequency of the sound waves produced by the loudspeakers is 206 . Consider point P between the speakers and along the line connecting them, a distance x to the right of speaker A. Both speakers emit sound waves that travel directly from the speaker to point P. For what values of x will there be constructive interference on point P? And for what values of x will the destructive interference on point p?