1. A steel metal rod is 5 m long and has a diameter of 1 cm. It is kept under a tension of 200 N and has a linear mass density of 0.617 kg/m and Young's modulus of 2.1 x 10^11 N/m^2. Calculate the time it takes for a sound wave to travel the length of the rod.

2. A 1 microcoulomb charge is placed at the origin of a Cartesian coordinate system. A 2 microcoulomb charge is then placed at x = 0 and y = 5 m while a -3 microcoulomb charge is placed at x = 5 m and y = 0. Calculate the force acting on the 2 microcoulomb charge and unambiguously indicate the direction of the force.