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The horizontal acceleration that should be given to a smooth inclined plane of angle sin11l to keep an object stationary on the plane, relative to the inclined plane is

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a
gl2−1
b
gl2−1
c
l2−1g
d
gl2+1

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detailed solution

Correct option is A

Resolve mg and pseudo force into componentsAt equilibrium mgsinθ=macosθ


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A uniform sphere of weight W and radius 3 m is being held by a string of length 2m.attached to a frictionless wall as shown in the t figure. The tension in the string will be:


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