>>8938996 lb
>>8939188 lb
>>8939169 lb
One further quick tutorial, as requested re: interference of waveforms
Is it Possible to Cancel Out a Wave?
Quick answer: Yes.
How: By interfering it with an equal and opposite wave.
What is meant by "equal and opposite"?
Take a wave form and invert it: where the original wave goes up, the inverted wave goes down.
If the original wave has a peak of +5 volts, the inverted wave has a trough of -5 volts at the same exact moment.
The +5 and -5 add together. The result is 0 volts (at that moment).
The principle has been used in noise-cancelling headphones, and in making quieter aircraft and cars. It became feasible with the advent of microprocessors and digital signal processors. In very simplified form it works something like this:
Place a microphone into a noisy environment.
Digitize the audio stream recorded by the mic.
Convert the positive numbers into negative numbers.
Play the result through a loudspeaker at the correct amplitude (volume).
The inverted wave cancels out the input wave.
The same can be done with EM waves such as radio waves.
You may have experienced this at home. If you ever set up a stereo system and hooked up one of the speakers backwards (reversed + and - polarity of the wiring) you will notice weird nulls in the room where the sound from the left speaker cancels out the sound from the right speaker. If you fix the + and - polarity, these strange nulls within the acoustic space are fixed.