The length of the string (l) is 150 cm and its linear mass density (μ) is 0.0035 kg/m. if the string oscillates with a frequency of 20 hz, determine the mass of the hanging mass

Rank the six combinations of electric charges on the basis of the electric force acting on q1. define forces pointing to the right as positive and forces pointing to the left as negative. rank positive forces as larger than negative forces. q1,q2,q3 = positive(+) q1 = + q2 = + q3 = - q1 = + q2= - q3= + q1= - q2= + q3= + q1= + q2= - q3= - q1,q2,q3 = negative