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Q.

A heavy wheel of radius 20cm and weight 10kg 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 (in kgwt) 3=1.732

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answer is 17.32.

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Detailed Solution

Question Image

Given : h=10cm ; R=20cm

x=R2-R-h2

Taking torques about O :  𝞽Mg=𝞽F 

FR-h=Mgx

⇒F×10cm=Mg×202-102  

⇒ F=103kgwt

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