A beaker is filled in with water is accelerated $a $ $m/s^2$ in $+x$ direction. The surface of water shall make on angle
Diffcult
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$\mathrm{P}_{\mathrm{A}}=\mathrm{P}_{0}$
$\mathrm{P}_{\mathrm{B}}=\mathrm{P}_{0}$
$\mathrm{P}_{\mathrm{B}}=\mathrm{P}_{\mathrm{A}}+\rho \mathrm{gh}-\rho \mathrm{a} \ell=\mathrm{P}_{0}$
$g h=a \ell$
$\tan \theta=\frac{h}{L}=\frac{a}{g}$
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