A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge? A. 2.2 ɥC
B. 680 ɥC
C. 2.2 C
D. 680 C

can someone explain this in detail because im having a hard time understanding these type questions...thank you!!

Acar is traveling at 53.0 mi/h on a horizontal highway. (a) if the coefficient of static friction between road and tires on a rainy day is 0.104, what is the minimum distance in which the car will stop?

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

The government has declared that a hurricane is likely to hit the east coast. which government division is part of acf and provides guidance to citizens? a. job opportunities for low-income individuals b. office of human services emergency preparedness and response c. assets for independence d. low-income home energy assistance program