JEE Main 201815 Apr, Evening shiftPhysicsMediumKinematics177× since 2002
A disc rotates about its axis of symmetry in a horizontal plane at a steady rate of revolutions per second. A coin placed at a distnce of 1.25 cm from the axis of rotation remains at rest on the disc. The coefficient of friction between the coin and the disc is : (g = 10 m/s²)