What is the wavelength of a sound wave moving at 340 m/s with a frequency of 400 Hz V=
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no. dot product   =0 when vecs at right angles

the higher the current the higher the mag field around it the higher the influence on the compass

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

gravitational energy

electrical energy

kinetic energy

ligh energy