Im hoping that this experimental setup is common enough in 1st year physics that someone could at least point me in right direction because I may be misunderstanding how the arm and pointer connect together.
I need to come up with an equation that relates how far the metal arm gets pushed out as the metal rod inside the chamber expands under heat, to the amount that the pointer rises on the ruler.
As the arm is pushed to the right (in the sketch) the pointer rises vertically along the ruler. I measured the length of the whole pointer to be 30cm, and also the length of the little arm that is pushed out (4cm).
I know my basic trig and I recognize that the angles change as the pointer rises. But what should the equation look like? Its a pretty bad sketch but hopefully it makes sense enough to comment, thanks for any help