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A passenger on a large ship sailing in a...

A passenger on a large ship sailing in a quiet sea hangs a ball from the celling of her cabin by means of a long thread. Whenever the ship acceleration when the pendulum stands at an angle of `5^(@)` to the vertical ?

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The ball is accelerated by the force T sin `5^(@).` Therefore T `sin5^(@)` = ma.
Vertical component `sumF=0,soT co5^(@)=mg.` By solving a = g `tan 5^(@)` = 0.0875 g = 0.86 `ms^(-2).`
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