Draw the scales of a msg showing 2.86mm for a 50 divisions msg

What is the effect on levels of liguid on a u-tube manometer when placed in a vacuum?

When I look at the tyres of a moving vehicle in a movie the look as if they are moving in the opposite direction. How can we explain this phenomenon/effect?

Explain why the handle of a door is placed as far as possible from the hinges. Explain why it is easier to loosen a tight nut using a spanner with a long handle than the one with a short handle.