5. A string of mass per unit length is clamped at both ends such that one end of the string is at x=0 and the other end at x = L. When string vibrates in fundamental mode, amplitude of the midpoint of string is a and tension is string is F. Find the total oscillation energy (in J) stored in the string. 1m) (Use L=1m, F = 10 N, a = m) x=0 x=L 6. 7. A massless metal plate is placed on a horizontal tabletop lubricated with oil. The sheet is a square of side length = 1.0m and the oil layer has thickness h = 1.0mm. Initially one edge of the sheet coincides with one edge of the table. The sheet is pulled outwards without rotation with a constant force F = 15 N. If coefficient of viscosity of the oil is n = 0.2 N-s/m, how long (in second) will it take to pull half of the sheet out of the table? Write the value of current i3 (in mA) in the circuit shown in the figure. 10 www I I 240V 60V www 5