4 Fig. 4 shows a block of mass 15 kg on a smooth plane inclined at \(20 ^ { \circ }\) to the horizontal. The block is held in equilibrium by a horizontal force of magnitude \(P \mathrm {~N}\).
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{2efbb554-fe60-42ce-9213-8c66bfdb1d85-2_280_718_1781_715}
\captionsetup{labelformat=empty}
\caption{Fig. 4}
\end{figure}
- Show all the forces acting on the block.
- Calculate \(P\).