John traveled on a motorbike a distance of 1,500 meters north to get to the nearest shopping center. he then turned back south and rode another 1,450 meters to meet his friend. what was his displacement?

How many molecules are present in 3 mols of silicon dioxide (sio2)?

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

Which transition by an electron will release the greatest amount of energy? oa ob oc od