If it takes 3.5 hours for the hogwarts express, moving at a speed of 120 mi/hr, to make it from platform 9 to hogwarts, how far apart are they?

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?

Based on the diagram of the electric field lines around the two spherical charges, what are the signs of the left and right charge respectively?