When the plate is stationary.
Answers
let,
The jet after striking the plate will move along the plate. But the plate is right angles to the jet. Hence the jet after striking will get deflected by 90°. Hence the component of the velocity of the jet, in the direction of the jet, after striking will be zero. The force exerted by the jet on the plate in the direction of the jet.
= (initial momentum - final momentum)/ time
For deriving the above equation, we have taken initial velocity minus final velocity and not final velocity minus initial velocity. If the force exerted on the jet is to be calculated then final minus the initial velocity is taken. But if the force exerted by the jet on the plate is to calculated, then initial velocity minus the final velocity is taken.
Force exerted by a jet on a stationary inclined flat plate :
Let a jet of water, coming out from the nozzle; strike an inclined flat plate as shown in the figure.2.
The impact of the jets in the surface makes the plate stationary.
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