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Show that the tension in the string $PA$ is $20\,\text{N}$, and determine the tension in the string $PB$.
Mathematics 9709 · AS & A Level · Forces and equilibrium
Forces and equilibrium — practice question
A particle $P$ with mass $2.1\,\text{kg}$ is connected to one end of each of two light inextensible strings. Their other ends are fixed to points A and B, which lie on the same horizontal line. $P$ is suspended in equilibrium $40\,\text{cm}$ beneath the level of A and B, and the strings $PA$ and $PB$ are $50\,\text{cm}$ and $104\,\text{cm}$ long respectively (see diagram).
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