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neeraj pawar Grade: 12
        

A uniform cube of mass m & side a is rsting on a rough 45 degree inclined surface. The distance of the point of application of normal reaction measured from the lower edge of the cube is:


a) zero


b) a/3


c) a/√2


d) a/4

7 years ago

Answers : (3)

anandpal shekhawat
8 Points
										

hi,


as normal rxn passes through centre & perpendicular to lower & upper faces & gap between centre & lower edge is


a/21/2


so (c) is correct. 



7 years ago
neeraj pawar
8 Points
										

no!!! ans is (a)

7 years ago
anandpal shekhawat
8 Points
										

hi, 


sorry for wrong ans.


now we will approach it as a case of toppling


MgsinΘ  is the component of weight which acts on centre at a distance a/2 from lower edge. so its torque will be


Τ1= MgsinΘ*a/2(.)


& normal  will nullify this effect so


T2 = MgcosΘ*r(×)


equating both


r=a/2 (from centre)


as normal passes through lower face


hence normal will pass through edge.


 


 


 


 


regards


anand


 

7 years ago
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