Дан невесомый рычаг с двумя противовесами на каждой стороне. Массы противовесов m1=6 кг, m2=112 кг и m3=13 кг. Какова масса противовеса m4, если рычаг находится в равновесии?

Pushkin's  poems,  the  girl's  voice,  the  new  workers'  club,  the  pete's  letter, my  parents'  car,  the  woman's  life, the  women's  handbags,  my  sister's  flat  is  large,  my  brother's  children  are  at  home,  the  boys'  room  is  large,  this  girl's name  is jane,  the  students'  work  is  interesting.

The fireman is a very interesting and dangerous profession.when    the fireman helping people, he  risks his life.this people must have good physical  parameters.and he must be brave and don't afraid come in the burning house. this profession   very intense because for fireman depending life of the peoples,therefore he must be responsible and was good reaction.as this profession was a good paying maybe this is one of its pluses. the firemans was respecting and considering a hero.they was authority at many people