A Atom is the basic unit of each type of element
As long as you describe the chemical reactions within the torpedo and explain how torpedoes advanced modern warfare.
Shear Stress= Force along the tangent/ Area
= 2700/π*r^2
=2700/3.14*16
=54
Regular trains follow train tracks and travel on rails; Maglev trains are Magnetically Levitated using powerful electromagnets, so that they actually hover slightly above the ground. This massively reduces friction and allows them to travel much faster (kind of like how a puck can go really far with only a little push on an air hockey table).
