A 4kg mass, suspended by two strings, revolves around a circle in radius at a speed of 3m/s as shown. Given each of the strings forms an angle of 45 degrees with the horizontal, calculate the tension in each of the strings. This problem is centered around Newton's 2nd Law and the application of Centripetal Force. It commonly comes up in introductory physics courses such as AP Physics 1, AP Physics C. It also serves as a foundation for problems that appear on A Levels Exams and the JEE.