CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

In the figure shown, the coefficient of static friction between B and the wall is 23 and the coefficient of kinetic friction between B and the wall is 13. Other contacts are smooth. If the minimum force F required to lift B up is xmg2, then find x. Mass of A is 2m and the mass of B is m. Take tanθ=34


Solution

The F.B.D. of A and B are
For A to be in equilibrium
F=Nsinθ        ... (1)
For B to just lift off
Ncosθ=mg+μsN   
(here μ=μs)  ......... (2)
For horizontal equilibrium of B
N=Nsinθ         ... (3)
From (2) and (3)
N(cosθμssinθ)=mg
or N(4523×35)=mg
or N=52mg           ... (4)
From equation (1)
F=N×35
             F=32mg

Physics

Suggest Corrections
thumbs-up
 
0


similar_icon
Similar questions
View More


similar_icon
People also searched for
View More



footer-image