You and a friend go to the park to use the seesaw. if you have a mass of 55 KG and your friend has a mass of 80 KG. You sit at the end of the seesaw which is 2M from the center. Where does your friend need to sit so you balance?

which three statements are true about all alloys?

heats surface water up

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