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let R2=kR1, 8*(4pi/3)(R1)3(k3-1)=(4pi/3)(R1)3k3, 8k3-8=k3,k=7k3=8,k=2/(7)1/3
(DA)gL/4=(DB)gL/3, DA/DB=4/3
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Dear Ajit ,
a) just immersed means that the weight of liquid displaced by it is just equal to its weight
mass of sphere = volume * density
= 4/3*∏* (R23- R13) * 8 = mass of water displaced = = 4/3*∏* (R23) * 1
so , 7R23 =8 R13 so , R1/R2 = (7/8)1/3
b) if the test tube are of equal lengths , then they must displace same amount of water and they both just immerse so their mass must also be equal
AL/4 * D1 = AL/3*D2
D1/D2 = 4 /3
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Dear Ajit,
8*(4pi/3)(R23-R13)=(4pi/3)R23, 7R23=8R13,R2/R1=2/(71/3)
let dA and dB be the densities of the two liquids, and let a and b be the cross-sectional areas of A and B respectively.w=density of water
dA(L/4)ag=Lawg, dA/4=w. similarly, we get dB/3=w, therefore dA/dB=4/3
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