"Moment of couple and torque have same SI unit". Explain.

A mass $m$ is supported by a massless string wound around a uniform hollow cylinder of mass $m$ and radius $R$. If the string does not slip on the cylinder, then with what acceleration will the mass release? (Assume $g=$ acceleration due to gravity)

A wheel of radius, $R$ with an axle of radius, $\frac{R}{2}$ is as shown in the figure and is free to rotate about a frictionless axis through its center and perpendicular to the page. Three forces $\left(F, F, 2 F\right)$, are exerted tangentially to the respective rims as shown in the figure.

The magnitude of the net torque acting on the system is nearly, 

What are the factors on which torque depends?

A uniform metre rule placed on a fulcrum at its middle point $O$ and having a weight $40 gf$ at $10 cm$ mark and a weight of $20 gf$ at the $90 cm$ mark, Is the metre rule in equilibrium? If not how will the rule turn?