33) In the first order of levers, what is between the resistance and the effort?
34) What is called the ratio of the resistance to the effort when they balance each other?
35) What is called the perpendicular distance from effort to fulcrum?
36) Write an example of second order of levers?
37) Write some example of the first order levers?
38) State the law of conservation of energy.
39) Who in 1643 was the first person to create vacuum above the liquid?
40) Who in 1786 invented the gold leaf electro scope?
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