Questions asked by Shura

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• How do you balance this redox reaction using the oxydation number method ? #KClO_3 + H_2SO_4 -> ClO_4^(-) + ClO_2 + SO_4^(2-) + K^(+) + H_2O#
  
• Two cylinders of mass m and radius R are rolling without slipping on an inclined plane. On them, there is a plank of mass M moving without slipping. How do you find the acc. of the plank depending on the acc. of one cylinder with Newton's laws ?
  
• How do you get #x_n>|x|/2# from #0<|x_n - x|<|x|/2# ?