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  • A balloon has mass of in air. The air escapes from the balloon at a uniform rate with vel

A balloon has mass of 10 \mathrm{~g} in air. The air escapes from the balloon at a uniform rate with velocity 4.5 \mathrm{~cm} / \mathrm{s}. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).
 

Option: 1

3


Option: 2

9


Option: 3

12


Option: 4

18


Answers (1)

best_answer

\mathrm{m=\log =10^{-2} \mathrm{~kg} }

\mathrm{F_{\text {avg }} =\left(\frac{\Delta m}{\Delta t}\right) \mathrm{V} }

           \mathrm{=\frac{10^{-2}}{5} \times 4.5 \times 10^{-2} }

           \mathrm{=\frac{9}{10} \times 10^{-4} }

           \mathrm{=9 \times 10^{-5} \mathrm{~N} }

  \mathrm{F_{avg}=9 \text { dyne }}

Hence 2 is correct option.





 

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mansi

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