Question

A coin placed on a rotating turntable just slips if it is placed at a distance of 4 cm from the centre. If the angular velocity of the turntable is doubled, it will just slip at a distance of –

• A. 1 cm
• B. 2 cm
• C. 4 cm
• D. 8 cm

Answer 1

Answer: (A)

1 cm

Answer 2

f = mw²r = constant or w²r = constant

r µ $\frac{1}{\omega^{2}}$ so distance will decreased by $\frac{1}{4}$ times