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Q.

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?

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a

tan−1⁡(a/g)

b

tan−1⁡(g/a)

c

cos−1⁡(a/g)

d

cos−1⁡(g/a)

answer is A.

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Detailed Solution

From △OAB, we havetan⁡θ=a/gθ=tan−1⁡(a/g)
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