how many marbels are there in a column if Navya arranged all the marble
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In order to accomodate maximum number of spheres, there should be hcp (hexagonal closed packing).
Area of square having spherical marbles =16 cm
2
Maximum number of spheres =14(full)+8(half)
Number of spheres =18
Per unit area (per cm
2
)=
16
18
=1.125
Length PQ of square =4 cm
Length PR=5+4×5
3
=40 mm=4 cm
CD=10sin60
∘
=
2
10
3
=5
3
.
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