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QJEEM16Ph9aeb: JEE Main 2016 Physics - Class 11 JEEM16Ph9aeb Solution: A rocket is fired vertically from the earth with an…

A rocket is fired vertically from the earth with an acceleration of 2g, where g is the gravitational acceleration. On an inclined plane inside the rocket, making an angle θ with the horizontal, a point object of mass m is kept. The minimum coefficient of friction μmin between the mass and the inclined surface such that the mass does not move is :

Multiple Choice Options

  • A tanθ
  • B 2tanθ
  • C 3tanθ
  • D tan2θ

Step-by-Step Verified Solution

Rocket is moving upward with acceleration 2g and gravitation acceleration is g downward direction.

So, acceleration experienced by the point object,

= 2g − (− g) = 3g

JEE Main 2016 (Online) 9th April Morning Slot Physics - Laws of Motion Question 107 English Explanation

At equilibrium,

N = 3mgcosθ

μN = 3mgsinθ

⇒   μ (3mgcosθ) = 3mg sinθ

⇒   μ = tanθ

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