Which of the following items is good conductor of electricity

What is the fate of the electrons that interact with a specimen in an electron microscope?

What is the final velocity of the initial velocity of 25 and -50?

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm