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A glass tube of radius 0.8 cm floats ver...

A glass tube of radius `0.8 cm` floats vertical in water, as shown in figure. What mass of lead pellets would cause the tube to sink a further`3 cm`?

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The correct Answer is:
C
Extra weight=extra upthrust on extra immersed volume.
`:. (Delta m)g=(pi r^(2) Delta h)rho_(w)g`
`:. Delta m =pi r^(2) Delta h rho_(w)`
`=(pi)(0.8)^(2)(3)(1)`
`=6.03g`.
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