a pendulum swings back and forth. how many times does it pass through the equilibrium position during one cycle of its motion? assume the cycle begins when the pendulum is at maximum displacement from equilibrium

terd muffin is the correct answer

the answer is b, have negligible mass

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