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If 500 erg of work is done in blowing a ...

If 500 erg of work is done in blowing a soap bubble to a radius r, what additional work is required to be done to blow it to a radius equal to 3r?

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SL ARORA-Mechanical Properties of fluids-Exercise
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  7. The average mass that must be lifted by a hydraulic press is 80 "kg".I...

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