Your task is to complete a program that reads a description of a mobile and computers, for each bar, the position along that bar where the string should be tied so that, when the bar is hanging from that string, it will be balanced. this position will be expressed as a fraction (between 0 and 1) of the length of the bar from the left end to the place where the string is tied.

Dereck works for long hours on his computer.  he frequently experiences physical strain by the end of the day because he does not follow an important rule of ergonomics with respect to the use of keyboards.  which of the following actions of dereck could lead to physical strain? a.  placing the keyboard exactly in front of him while typingb.  keeping hands and wrists straight while typingc.  using wrist pads throughout the dayd.  pounding at the keys on the keyboard while typinge.  resting his hands on the keyboard when he is not typing