Sir particles of mass 1,2,3,4,5 and 6 kg are placed at the corners of a hexagon of side L. Find the distance between the center of this hexagon and centre of gravity.
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Let the Centre of the hexagon be at coordinate (0,0).
Then the six individual points of the hexagon with the respective weight are at coordinates : (-L/2, -L√3/2), (L/2, -L√3/2) ,(L,0) , (L/2, L√3/2), (-L/2, L√3/2), (-L,0),.
Hence X coordinate of the center of gravity =
[-(L/2 x 1) +(L/2 x 2) -( L x 3) + (L/2 x 4) -( L/2 x 5) - (L/2 x 6)]/21
= -L/7
Similarly Y coordinate of the center of gravity is =
[(-L√3/2 x 1) - (L√3/2 x 2) + 0x3 + (L√3/2 x 4) + (L√3/2 x 5) + 0x6 ]/21
= L√3/7
Hence distance between centre of hexagon (0,0) and centre of gravity (-L/7 , L√3/7)
= √(L²/49 + 3L²/49)
= 2L/7
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