Two horizontal parallel plates are separated by a distance of (176 mm) creating an electric field of (21 µN/C) directed north. An electron is place halfway between the two plates with and fired with initial velocity (56 m/s) from the horizontal. Calculate the time it takes for the electron to land at the positive plate and its speed before hitting the plate.

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.