Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel. during the process, 9.5 kj of heat is transferred to the water, and 5.4 kj of heat is lost to the surrounding air. the paddle-wheel work input is 579 n∙m. determine the mass in the system if its change in specific internal energy is 5 kj/kg.

the closer the planet is to the sun, the larger the gravity

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

elctricity and magnet is conversion to it