Two waves travel simultaneously through the same medium. The first wave is described by y 1( x, t) = (1.00 cm)cos( kx- wt)and the second wave by y 2( x, t) = (8.00 cm)sin( kx- wt). What is the amplitude of the resulting wave (in cm)?

the answer is to check all of them! they all apply well at least i think so!

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

i already answered it by 34/s