14 Blocks A and B are connected by a light rigid horizontal bar and are sliding on a rough horizontal surface.
A light horizontal string exerts a force of 40 N on B .
This situation is shown in Fig. 14, which also shows the direction of motion, the mass of each of the blocks and the resistances to their motion.
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ff44367e-c992-4e79-b255-5a04e0b8e21e-11_266_1283_664_255}
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\caption{Fig. 14}
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- Calculate the tension in the bar.
The string breaks while the blocks are sliding. The resistances to motion are unchanged.
- Determine
- the magnitude of the new force in the bar,
- whether the bar is in tension or in compression.