Angelika is building a barbecue on a rectangular concrete slab. The slab is to be 2·4 m long and 1·8 m wide. What should the length of the diagonal be?
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The slab is lifted to stand on shorter side; the height of the center of mass of the slabs will be at half the height of the longer side i.e. centre of mass is the slab move from an height=0 to height = 1/2
• Therefore, h= 1/2 = 3·4/2 = 17m ·0
→ we know₂ F = mg
Therefore W= mgh = 180×9.8×1.7 = 3000J = 3KJ
•• Total work done to make rectangular slab Stand on the shortes side u 3kJ.
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