JEE Main 2016 Physics question
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 with the horizontal, a point object of mass m is kept. The minimum coefficient of friction between the mass and the inclined surface such that the mass does not move is:
Answer: (2)
Solution
Work in the non-inertial frame of the rocket. The rocket accelerates upward at , so every object inside experiences a downward pseudo-force in addition to its real weight . The effective gravitational field is therefore , still directed vertically downward. On the incline,
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