Recent content by whonut

I am doing an experiment where we have to use the threshold voltage of LEDs to determine Planck's constant given the following relation $$ eV_0 = E_g = \frac{hc}{\lambda} $$ where ## V_0 ## is the threshold voltage, ## \lambda ## is the wavelength of emitted light and ## E_g ## is the band...

I've done the energy thing. Much more straightforward but less apparently less general. I got it from the fact that T1 and mg are the only forces on the block & result in the acceleration. Am I wrong there?

I am so bad at forums! It's ##T_1-mg=ma##, I believe. Can I solve it from there?

Yet another error in my OP. I put that in but screwed up the LaTeX. It's ##a=\alpha{r}##, right? My first thought was that the linear acceleration of the box was just the sum of the 2 cylinders' linear accelerations but I can't get the tension terms to go away. Is it just my algebra?

Oh hell. Copied the set up and not the question! Apologies. I've edited the original post.

Homework Statement A cylinder and pulley turn without friction about stationary horizontal axles that pass through their centres. A light rope is wrapped around the cylinder, passes over the pulley, and has a 3.00 kg box suspended from its free end. There is no slipping between the rope and the...