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BITSAT 2014
Exam
BITSAT
Year
2014
Subject
Physics
Chapter
Mechanical Properties of Fluids

BITSAT 2014 · Physics · Mechanical Properties of Fluids

The work done in blowing a soap bubble of surface tension 0.06 ×...

The work done in blowing a soap bubble of surface tension 0.06×Nm−10.06 \times \mathrm{Nm}^{-1} from 2cm2 \mathrm{ cm} radius to 5cm5 \mathrm{ cm} radius is

Options

  1. A0.004168J0.004168 \mathrm{ J}
  2. B0.003168J0.003168 \mathrm{ J}
  3. C0.003158J0.003158 \mathrm{ J}
  4. D0.004568J0.004568 \mathrm{ J}

Correct answer

B. 0.003168J0.003168 \mathrm{ J}

Step-by-step solution

ΔW=S×ΔA=0.06×4π(r22−r12)=0.003168J\begin{aligned} \Delta \mathrm{W} &=\mathrm{S} \times \Delta \mathrm{A}=0.06 \times 4 \pi\left(\mathrm{r}_{2}^{2}-\mathrm{r}_{1}^{2}\right) \\ &=0.003168 \mathrm{ J} \end{aligned}
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