Abrother and sister try to communicate with a string tied between two tin cans. if the string is 9.5 m long, has a mass of 32 g, and is pulled taut with a tension of 8.6 n, how much time does it take for a wave to travel from one end of the string to the other ?

Two charged particles, q1 and q2, are located on the x-axis, with q1 at the origin and q2 initially at x1 = 12.2 mm. in this configuration, q1 exerts a repulsive force of 2.62 µn on q2. particle q2 is then moved to x2 = 18.0 mm. what is the force (magnitude and direction) that q2 exerts on q1 at this new location? (give the magnitude in µn.)