Q$1-$a$)$ Given $T={}^{**}d\frac{u}{d}y,$ where $T$ is shear stress, $u$ is velocity and $y$ is

distance, what are the $SI$ units and dimensions of $?$

Q$1-$b$)$ A force $F=500N$ is applied to the smaller cylinder of hydraulic jack.

The area of the small piston side is $20c{m}^2$ while the area of the large piston

side is $200c{m}^2.$ What mass can be lifted on the large piston side?