- #1

Hashika

- 4

- 0

## Homework Statement

You are working for the Peace Corps in a developing country. Your job is to design a simple, but accurate scale for weighing bulk materials such as food and construction materials. A possible idea consists of a loading platform, D, that is supported by cable AB, where end A is attached to a large tree limb. After loading

platform D, weight W3 is applied, which causes point B to move horizontally by a small distance delta that can be measured using a yardstick.

Assume:

W2 = weight of the loading platform = 50kg

W1 = weight of materials being weighed ≤ 250 kg

Pulley C is frictionless

You are to specify:

L = length of cable AB, where L is less than 5m.

W3 = weight of the counterweight, where W3 ≤ 20kg.

For the specific values of L and W3 you choose, produce a graph with W1 and delta as the vertical and horizontal axes, respectively. Therefore, by measuring the deflection, delta, your graph will tell the user what the weight W1being measured is.

## Homework Equations

Newton's Second Law

## The Attempt at a Solution

Not a clue how to start, is the system in static equilibrium? If so, then I'd assume to set all the forces at point B = 0. But then I'd have to assign an angle theta that is another variable. I'm so confused.