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Q.

A heavy wheel of radius 20 cm and weight 10 kg is to be dragged over a step of height 10 cm, by a horizontal force F applied at the centre of the wheel. The minimum value of F is

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a

20 kgwt

b

1 kgwt

c

10√3 kgwt

d

10√2 kgwt

answer is C.

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Detailed Solution

Height of step = 10 cm; OA = 20 cm; OB = 10 cm Toppling moment about A must be greater than restoring moment about A.
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A heavy wheel of radius 20 cm and weight 10 kg is to be dragged over a step of height 10 cm, by a horizontal force F applied at the centre of the wheel. The minimum value of F is