A mass is suspended by a string from the ceiling of a train accelerating horizontally at 2.5 m/s^2. what is the angle that the string makes with the vertical ? (ans:14
السؤال الثاني
block A of mass 6 kg and block B of mass 8 kg connected by a rigid rod of negligible mass. Force Fa=16i N acts on block A and force Fb = -30 i N acts on B . what is the tension in the rod? (Neglect friction) ans; 22 N