First slide

Fluid statics

Question

A plumb line is suspended from the ceiling of a car moving with horizontal acceleration of a. What will be the angle of inclination with vertical?

Easy

A

$\tan^{- 1} (a / g)$
B

$\tan^{- 1} (g / a)$
C

$\cos^{- 1} (a / g)$
D

$\cos^{- 1} (g / a)$

Solution

From $△ OAB$ , we have
$\begin{aligned} \tan θ = a / g \\ θ = \tan^{- 1} (a / g) \end{aligned}$

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