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  • A jet of water with cross section of strikes a wall at an angle of <img alt="60^{\c

A jet of water with cross section of 6 \mathrm{~cm}^2 strikes a wall at an angle of 60^{\circ} to the normal and rebounds elastically from the wall without losing energy. If the velocity of the water in the jet is 12 \mathrm{~m} / \mathrm{s}, the force acting on the wall is

Option: 1

0.864 Nt


Option: 2

86.4 Nt


Option: 3

72 Nt


Option: 4

7.2 Nt


Answers (1)

best_answer

\mathrm{\begin{aligned} & \frac{\mathrm{dm}}{\mathrm{dt}}=\rho \mathrm{Av} \\ & \Delta \mathrm{P}=\mathrm{F}_{\text {avg }} \text {. 1sec. } \quad \Rightarrow 2 \rho A v^2 \cos 60^{\circ} \\ & \Rightarrow 1000 \times 6 \times 10^{-4} \times(12) \times \frac{1}{2} \times 2 \\ & =86.4 \mathrm{Nt} \text {. } \\ & \end{aligned}}

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shivangi.shekhar

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