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If a jet of water of area ‘A’ strikes with velocity ‘V’ a series of flat plates mounted on a wheel of mean diameter D rotating at N rpm, then force exerted will be equal to
$$\frac{\rho AV^2}{g}$$
$$\frac{\rho AV}{g}\left(V - \frac{\pi DN}{60}\right)$$
$$\frac{\rho A}{g} \times \frac{\pi DN}{60}$$
$$\rho A\left(V - \frac{\pi DN}{60}\right)$$
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