Ajet of water having velocity $=$ $10 $ $m/s$ and stream cross-section $=$ $2$ $cm^2$ hits a flat plate perpendicularly, with the water splashing out parallel to plate. The plate experiences a force of ....... $N$
Diffcult
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Force $=$ change is linear momentum
$F=\frac{m v}{t} \Rightarrow F=\frac{V}{t} \times \rho \times v \Rightarrow F=a . v . \rho . v \Rightarrow F=a \rho v^{2}$
$F=2 \times 10^{-4} \times 1000 \times(10)^{2} \Rightarrow F=20 N$
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