Work done in blowing or expanding a soap bubble

1. A.
   $W_2 = W_1$
2. B.
   $W_2 = 4W_1$
3. C.
   $W_2 < 4W_1$
4. D.
   $W_2 = 0$

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1. A.
   $W_2 = 0$
2. B.
   $W_2 = 4W_1$
3. C.
   $W_2 < 4W_1$
4. D.
   $W_2 = W_1$

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1. A.
   $W$
2. B.
   $2W$
3. C.
   $\frac{W}{2}$
4. D.
   $W \cdot 4^{1/3}$

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1. A.
   exactly double
2. B.
   slightly more than 4 times
3. C.
   slightly less than 4 times
4. D.
   slightly less than double

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1. A.
   $\frac{W}{2}$
2. B.
   $2W$
3. C.
   $2^{1/3}W$
4. D.
   $4^{1/3}W$

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1. A.
   $\ \pi\left( D^{2} - d^{2} \right)T$
2. B.
   $\ 2\pi\left( D^{2} - d^{2} \right)T$
3. C.
   $\ 4\pi\left( D^{2} - d^{2} \right)T$
4. D.
   $\ 8\pi\left( D^{2} - d^{2} \right)T$

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1. A.
   slightly less than $4$ times
2. B.
   exactly double
3. C.
   slightly less than double
4. D.
   slightly more than $4$ times

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1. A.
   $800$
2. B.
   $1200$
3. C.
   $1600$
4. D.
   $2400$

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1. A.
   $2400$ erg
2. B.
   $3000$ erg
3. C.
   $3600$ erg
4. D.
   $4000$ erg

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