Moment of a force of magnitude $10 \mathrm{N}$ acting along positive $y$-direction at point $\left(2 \mathrm{m},0,0\right)$ about the point $\left(0,1 \mathrm{m},0\right)$ in $\mathrm{N}-\mathrm{m}$ is

A disk having a thread tightly wound on it, is being pulled upwards by the thread such that the disk starts moving upwards with an acceleration $g$. If angular acceleration is $\alpha$ and radius $R$, then the value of $R\alpha$ is

The moment of inertia of a disc about axis $O$$O\text{'}$ is $Nm{r}^2$. Axis is in the plane of disc and tangential. Then the value of $N$ is: