Chapter 8, Problem 22P

(a)

To determine

The force diagram of each rod if you are building a toy mobile by copying the design as in the provided figure, where the bottom rod is $20\text{cm}$ long, the middle rod is $15\text{cm}$ long, the top rod is $8\text{cm}$ long and you put one penny in the bottom left cup, three pennies in the bottom right cup, eleven pennies in the middle right cup, and five pennies in the top left cup.

(b)

To determine

The chord attachment point and the length of each side of the rod if you are building a toy mobile by copying the design as provided in the figure, where the bottom rod is $20\text{cm}$ long, the middle rod is $15\text{cm}$ long, the top rod is $8\text{cm}$ long and you put one penny in the bottom left cup, three pennies in the bottom right cup, eleven pennies in the middle right cup, and five pennies in the top left cup.

(c)

To determine

The assumption made to solve the problem if you are building a toy mobile by copying the design as provided in the figure, where the bottom rod is $20\text{cm}$ long, the middle rod is $15\text{cm}$ long, the top rod is $8\text{cm}$ long and you put one penny in the bottom left cup, three pennies in the bottom right cup, eleven pennies in the middle right cup, five pennies in the top left cup.