- #1

cremelatte

- 6

- 0

## Homework Statement

A boy wants to reach a durian in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, he pulls on the loose end of the rope with such a force that the spring scale reads 250N. The boy and the chair have masses 32kg and 16kg respectively.

a) show that the acceleration of the system is upward

b) find the magnitude of the acceleration

c) calculate the force the boy exerts on the chair

## Homework Equations

2T + N - N - Wb - Wc

2T - Wb - Wc = (mb + mc)a

T + N - Wb = mba

T- N - Wc = mc a

## The Attempt at a Solution

b) a = 0.61m/s

c) N =83N

My school teacher has gone through this question and he explained a million times but i don't get the equations above that he was trying to explain. I don't get why there's two T and why the boy and the chair are kind of different and everything is pretty confusing. Yup can someone explain how the boy even pulls himself and all the forces ;0