Wo stationary positive point charges, charge 1 of magnitude 3.35 nc and charge 2 of magnitude 1.55 nc , are separated by a distance of 58.0 cm . an electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges. what is the speed vfinal of the electron when it is 10.0 cm from charge 1?
express your answer in meters per second.

Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?