A motor has coils with a resistance of 3012 and operates from a voltage of 240 V. When the motor is operating at its maximum speed, the back emf is 145V. Find the current in the coils a) when the motor is first turned on b) when the motor has reached maximum speed c) If the current in the motor is 6.0A at some instant, what is the back emf at that time?​

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d

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?