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Grade: 11
        
Three similar cubical slabs of mass m n edge b are lying on ground work done to arrange them one over other
 
3 months ago

Answers : (1)

Arun
22595 Points
							
 
Work done in placing first cube is 0.
Work done in placing 2nd cube is mgl.
Similarly, W3=2mgl,.....,Wn=(n-1)mgl.
 Wnet= W1+W2+W3+......+W(n-1)
          = mgl{1+2+3+....+(n-1)}
          = mgl{Sn}
          = mgl{(n-1)/2 [2×1+(n-1-1)1]}
          = mgl{(n-1)/2×n}
Wnet = mgln(n-1)/2.
 
Put here n = 3
3 months ago
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