State the supplementary units of the $SI$ system.

Temperature can be expressed as a derived quantity in terms of any of the following:

It is estimated that per minute each $cm^2$ of the Earth receives about $2 \ cal$ $(1 \ cal = 4.18 \ J)$ of heat energy from the Sun. This is called the Solar constant. In $SI$ units,the value is: (in $W/m^2$)

The unit of power is:

If $1 \ gm \ cm \ s^{-1} = x \ Ns$,then $x = $

Explain the difference between $nm$, $mN$, and $Nm$.