A mobile phone is charged by connecting the phone to a mobile charger that we plug into the socket, the mobile charger contains a transformer. Whyr?

40 POINTS!

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a. m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?