A narrow belt is used to drive a 50 cm diameter pulley from a 10 cm diameter pulley. The centers of the pulleys are 50 cm apart.
a.How long must the belt be if the pulleys are rotating in the same direction?
b How long must the belt be if the pulleys are rotating in the opposite direction...(the belt crosses over itself between the two pulleys)?
a. one pulley is 50 cm so its radius is 25cm
the other pulley is 10 cm so its radius is 5 cm
they are 50 cm apart from their centers.
the belt needs to be 80 cm long. Is that correct?
I'm not sure how to do part b of this question.
In addition, does anyone know where I can read more about situations like this so I can understand the situation better?